diff --git a/default.nix b/default.nix
index 4b49658..2a287bb 100644
--- a/default.nix
+++ b/default.nix
@@ -1,5 +1,4 @@
-{
-  lib,
+{ lib,
   rustPlatform,
   nix-gitignore,
   bash,
@@ -11,43 +10,63 @@
   pkg-config,
   libxkbcommon,
   pkgs,
+  stdenv,
+  targetPackages ? pkgs,
 }: let
   version = (builtins.fromTOML (builtins.readFile ./engine/Cargo.toml)).package.version;
   src = nix-gitignore.gitignoreSource [] ./.;
 in
-  rustPlatform.buildRustPackage rec {
-    pname = "zenyx";
-    inherit src version;
-    cargoLock.lockFile = ./Cargo.lock;
-    nativeBuildInputs = [
-      makeWrapper
-      pkg-config
-    ];
-    buildInputs = with pkgs; [
-      wayland
-      vulkan-loader
-      libxkbcommon
-      libGL
-      libxkbcommon
-      xorg.libXcursor
-      xorg.libXrandr
-      xorg.libXi
-      xorg.libX11
-      xorg.libxcb
-      bash
-      dav1d
-    ];
-    doCheck = false;
-    LD_LIBRARY_PATH = "${pkgs.lib.makeLibraryPath buildInputs}";
+rustPlatform.buildRustPackage rec {
+  pname = "zenyx";
+  inherit src version;
+  cargoLock.lockFile = ./Cargo.lock;
 
-    fixupPhase = ''
-      wrapProgram $out/bin/${pname} --set PATH ${bash}/bin:\$PATH --set LD_LIBRARY_PATH ${pkgs.lib.makeLibraryPath buildInputs}
-    '';
+  nativeBuildInputs = [
+    pkg-config
+  ] ++ lib.optionals stdenv.targetPlatform.isDarwin [
+    targetPackages.darwin.apple_sdk.frameworks.CoreServices
+  ]; 
 
-    meta = {
-      description = "Test";
-      license = lib.licenses.mit;
-      platforms = lib.platforms.linux;
-      mainProgram = "zenyx";
-    };
-  }
+  buildInputs = with targetPackages; [
+    dav1d
+  ] ++ lib.optionals (stdenv.targetPlatform.isLinux || stdenv.targetPlatform.isWindows) [
+    vulkan-loader
+  ] ++ lib.optionals stdenv.targetPlatform.isLinux [
+    makeWrapper
+    wayland
+    libxkbcommon
+    libGL
+    xorg.libXcursor
+    xorg.libXrandr
+    xorg.libXi
+    xorg.libX11
+    xorg.libxcb
+    bash 
+  ] ++ lib.optionals stdenv.targetPlatform.isDarwin [
+    makeWrapper
+    darwin.apple_sdk.frameworks.Cocoa
+    darwin.apple_sdk.frameworks.Metal
+    darwin.apple_sdk.frameworks.CoreVideo
+    darwin.apple_sdk.frameworks.QuartzCore
+  ];
+
+  CARGO_TARGET_X86_64_PC_WINDOWS_GNU_LINKER = 
+    lib.optionalString stdenv.targetPlatform.isWindows "${stdenv.cc.targetPrefix}gcc";
+
+  NIX_LDFLAGS = lib.optionalString stdenv.targetPlatform.isDarwin "-framework CoreFoundation";
+
+  postInstall = lib.optionalString stdenv.targetPlatform.isLinux ''
+    wrapProgram $out/bin/${pname} \
+      --prefix PATH : ${lib.makeBinPath [ bash ]} \
+      --set LD_LIBRARY_PATH ${lib.makeLibraryPath buildInputs}
+  '';
+
+  doCheck = false;
+
+  meta = {
+    description = "Cross-platform WSYWIG Game Engine";
+    license = lib.licenses.mit;
+    platforms = lib.platforms.all;
+    mainProgram = "zenyx";
+  };
+}
\ No newline at end of file
diff --git a/engine/src/core/ecs/mod.rs b/engine/src/core/ecs/mod.rs
index e69de29..37b0ab7 100644
--- a/engine/src/core/ecs/mod.rs
+++ b/engine/src/core/ecs/mod.rs
@@ -0,0 +1,170 @@
+use std::any::{Any, TypeId};
+use std::collections::HashMap;
+use std::sync::Mutex;
+
+pub trait Component: Sized + 'static {
+    fn update(&mut self, delta_time: f32);
+    fn serialize(&self) -> Vec<u8>;
+    fn deserialize(data: &[u8; 6]) -> Self;
+}
+
+pub trait Entity: Sized {
+    fn add_component<C: Component>(&mut self, component: C);
+    fn remove_component<C: Component>(&mut self);
+    fn get_component<C: Component>(&self) -> Option<&C>;
+    fn serialize(&self) -> Vec<u8>;
+    fn deserialize(data: &[u8; 6]) -> Self;
+}
+lazy_static::lazy_static! {
+    // Global registry mapping component TypeId to a unique bit flag.
+    static ref COMPONENT_REGISTRY: Mutex<HashMap<TypeId, u64>> = Mutex::new(HashMap::new());
+    static ref NEXT_COMPONENT_BIT: Mutex<u64> = Mutex::new(1);
+}
+
+// To allow dynamic dispatch on components (even though Component itself is not object‐safe)
+// we wrap them in an object–safe trait.
+pub trait ComponentObject: Any {
+    fn update_obj(&mut self, delta_time: f32);
+    fn serialize_obj(&self) -> Vec<u8>;
+    fn as_any(&self) -> &dyn Any;
+}
+impl<T: Component + 'static> ComponentObject for T {
+    fn update_obj(&mut self, delta_time: f32) {
+        T::update(self, delta_time)
+    }
+    fn serialize_obj(&self) -> Vec<u8> {
+        T::serialize(self)
+    }
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+}
+
+pub struct EntityImpl {
+    id: usize,
+    bitmask: u64,
+    // The key is the unique bit flag for the component type.
+    components: HashMap<u64, Box<dyn ComponentObject>>,
+}
+
+impl EntityImpl {
+    pub fn new(id: usize) -> Self {
+        EntityImpl {
+            id,
+            bitmask: 0,
+            components: HashMap::new(),
+        }
+    }
+}
+
+impl Entity for EntityImpl {
+    fn add_component<C: Component>(&mut self, component: C) {
+        let type_id = TypeId::of::<C>();
+        let mut registry = COMPONENT_REGISTRY.lock().unwrap();
+        let bit = registry.entry(type_id).or_insert_with(|| {
+            let mut next_bit = NEXT_COMPONENT_BIT.lock().unwrap();
+            let current = *next_bit;
+            *next_bit *= 2;
+            current
+        });
+        self.bitmask |= *bit;
+        self.components.insert(*bit, Box::new(component));
+    }
+
+    fn remove_component<C: Component>(&mut self) {
+        let type_id = TypeId::of::<C>();
+        if let Some(&bit) = COMPONENT_REGISTRY.lock().unwrap().get(&type_id) {
+            self.bitmask &= !bit;
+        }
+    }
+
+    fn get_component<C: Component>(&self) -> Option<&C> {
+        let type_id = TypeId::of::<C>();
+        if let Some(&bit) = COMPONENT_REGISTRY.lock().unwrap().get(&type_id) {
+            self.components
+                .get(&bit)
+                .and_then(|boxed| boxed.as_any().downcast_ref::<C>())
+        } else {
+            None
+        }
+    }
+
+    fn serialize(&self) -> Vec<u8> {
+        // Serialize the entity's bitmask into 6 bytes (lowest 48 bits).
+        let mut bytes = self.bitmask.to_le_bytes().to_vec();
+        bytes.truncate(6);
+        bytes
+    }
+
+    fn deserialize(data: &[u8; 6]) -> Self {
+        let mut full = [0u8; 8];
+        full[..6].copy_from_slice(data);
+        let bitmask = u64::from_le_bytes(full);
+        // When deserializing, we recreate an entity with the restored bitmask.
+        // Note: The individual component data are not restored here.
+        Self {
+            id: 0,
+            bitmask,
+            components: HashMap::new(),
+        }
+    }
+}
+
+pub struct ECS {
+    next_entity_id: usize,
+    pub entities: HashMap<usize, EntityImpl>,
+}
+
+impl ECS {
+    pub fn new() -> Self {
+        ECS {
+            next_entity_id: 0,
+            entities: HashMap::new(),
+        }
+    }
+
+    pub fn create_entity(&mut self) -> &mut EntityImpl {
+        let entity = EntityImpl::new(self.next_entity_id);
+        self.entities.insert(self.next_entity_id, entity);
+        self.next_entity_id += 1;
+        self.entities.get_mut(&(self.next_entity_id - 1)).unwrap()
+    }
+
+    pub fn update(&mut self, delta_time: f32) {
+        for entity in self.entities.values_mut() {
+            // Update each component attached to the entity.
+            for comp in entity.components.values_mut() {
+                comp.update_obj(delta_time);
+            }
+        }
+    }
+
+    pub fn serialize(&self) -> Vec<u8> {
+        let mut data = Vec::new();
+        // For each entity, store its id (8 bytes) and its 6-byte bitmask.
+        for (id, entity) in &self.entities {
+            data.extend_from_slice(&id.to_le_bytes());
+            data.extend_from_slice(&entity.serialize());
+        }
+        data
+    }
+
+    pub fn deserialize(&mut self, data: &[u8]) {
+        self.entities.clear();
+        // Each serialized entity uses 8 (id) + 6 (bitmask) = 14 bytes.
+        let entity_size = 14;
+        let count = data.len() / entity_size;
+        for i in 0..count {
+            let offset = i * entity_size;
+            let mut id_bytes = [0u8; 8];
+            id_bytes.copy_from_slice(&data[offset..offset + 8]);
+            let id = usize::from_le_bytes(id_bytes);
+
+            let mut mask_bytes = [0u8; 6];
+            mask_bytes.copy_from_slice(&data[offset + 8..offset + 14]);
+            let entity = EntityImpl::deserialize(&mask_bytes);
+            self.entities.insert(id, entity);
+        }
+        self.next_entity_id = count;
+    }
+}
diff --git a/engine/src/core/panic.rs b/engine/src/core/panic.rs
index 08e5124..b76d9a9 100644
--- a/engine/src/core/panic.rs
+++ b/engine/src/core/panic.rs
@@ -49,33 +49,39 @@ fn process_panic(info: &std::panic::PanicHookInfo<'_>) -> Result<(), Box<dyn Err
     writeln!(file, "{}", render_backtrace().sanitize_path())?;
 
     let panic_msg = format!(
-"Zenyx had a problem and crashed. To help us diagnose the problem you can send us a crash report.
+        r#"Zenyx had a problem and crashed. To help us diagnose the problem you can send us a crash report.
 
 We have generated a report file at '{}'. Submit an issue or email with the subject of 'Zenyx Crash Report' and include the report as an attachment.
 
 To submit the crash report:
-
 https://github.com/Zenyx-Engine/Zenyx/issues
 
 We take privacy seriously, and do not perform any automated error collection. In order to improve the software, we rely on people to submit reports.
 
-Thank you kindly!", log_path.display());
-    println!("{}", panic_msg.red().bold());
-    println!(
-        "\nFor future reference, the error summary is as follows:\n{}",
-        payload_str.red().bold()
+Thank you kindly!"#,
+        log_path.display()
     );
-    if let Err(e ) = MessageDialog::new()
-        .set_type(MessageType::Error)
-        .set_title(&format!("{}",payload_str))
-        // wont display properly if not debug formatted??
-        .set_text(&format!("{:#?}", panic_msg))
-        .show_alert() {
-            error!("{e}");
-        }
-    Ok(())
-}
 
+    let final_msg = format!(
+        r#"{}
+
+For future reference, the error summary is as follows:
+{}"#,
+        panic_msg, payload_str
+    );
+
+    println!("{}", final_msg.red().bold());
+
+    MessageDialog::new()
+        .set_type(MessageType::Error)
+        .set_title("A fatal error in Zenyx has occurred")
+        .set_text(&final_msg)
+        .show_alert()
+        .map_err(|e| {
+            error!("Failed to show error dialog: {}", e);
+            e.into()
+        })
+}
 fn render_backtrace() -> String {
     const HEX_WIDTH: usize = mem::size_of::<usize>() * 2 + 2;
     const NEXT_SYMBOL_PADDING: usize = HEX_WIDTH + 6;
diff --git a/engine/src/core/render/ctx.rs b/engine/src/core/render/ctx.rs
index 3df1bfc..2190e21 100644
--- a/engine/src/core/render/ctx.rs
+++ b/engine/src/core/render/ctx.rs
@@ -5,6 +5,7 @@ use std::time::Instant;
 
 use cgmath::{Deg, Matrix4, Point3, Rad, SquareMatrix, Vector3, perspective};
 use futures::executor::block_on;
+use thiserror::Error;
 use tracing::{debug, error, info, trace};
 use wgpu::TextureUsages;
 use wgpu::{Backends, InstanceDescriptor, util::DeviceExt};
@@ -223,7 +224,7 @@ struct FontState {
 impl<'window> Renderer<'window> {
     pub async fn new(window: Arc<Window>) -> Result<Self> {
         let instance = wgpu::Instance::new(&InstanceDescriptor {
-            backends: Backends::from_comma_list("dx12,metal,opengl,webgpu"),
+            backends: Backends::from_comma_list("dx12,metal,opengl,webgpu,vulkan"),
             ..Default::default()
         });
 
@@ -344,22 +345,31 @@ impl<'window> Renderer<'window> {
         let camera = Camera::new(&device, &camera_bind_group_layout, width, height);
 
         let surface_caps = surface.get_capabilities(&adapter);
+        let present_mode = [
+            wgpu::PresentMode::Immediate,
+            wgpu::PresentMode::Mailbox,
+            wgpu::PresentMode::AutoNoVsync,
+        ]
+        .iter()
+        .copied()
+        .find(|mode| surface_caps.present_modes.contains(mode))
+        .unwrap_or(wgpu::PresentMode::Fifo);
+
+        debug!("Using {:#?} present mode.", present_mode);
+
         let surface_config = wgpu::SurfaceConfiguration {
             width,
             height,
             format: surface_caps.formats[0],
-            present_mode: wgpu::PresentMode::AutoNoVsync,
+            present_mode,
             alpha_mode: wgpu::CompositeAlphaMode::Auto,
             view_formats: vec![],
             usage: TextureUsages::RENDER_ATTACHMENT,
             desired_maximum_frame_latency: 3,
         };
         surface.configure(&device, &surface_config);
-        let (depth_texture, depth_texture_view) = create_depth_texture(
-            &device,
-            surface_config.width,
-            surface_config.height,
-        );
+        let (depth_texture, depth_texture_view) =
+            create_depth_texture(&device, surface_config.width, surface_config.height);
 
         let font_bytes = include_bytes!("DejaVuSans.ttf");
         let font = FontRef::try_from_slice(font_bytes).map_err(|e| {
@@ -605,7 +615,6 @@ fn create_depth_texture(
     device: &wgpu::Device,
     width: u32,
     height: u32,
-    // format: wgpu::TextureFormat,
 ) -> (wgpu::Texture, wgpu::TextureView) {
     let size = wgpu::Extent3d {
         width,
diff --git a/engine/src/core/render/mod.rs b/engine/src/core/render/mod.rs
index 900486c..d841521 100644
--- a/engine/src/core/render/mod.rs
+++ b/engine/src/core/render/mod.rs
@@ -7,12 +7,15 @@ use winit::dpi::Size;
 use std::env;
 use std::fs;
 use std::path::PathBuf;
+use tobj::Mesh;
 use tobj::{LoadOptions, Model};
 use tracing::{debug, error, info, trace, warn};
 use wgpu::rwh::HasWindowHandle;
 use winit::application::ApplicationHandler;
 use winit::event::{KeyEvent, WindowEvent};
 use winit::event_loop::{ActiveEventLoop, ControlFlow, EventLoop};
+use winit::monitor::MonitorHandle;
+use winit::window::Fullscreen;
 use winit::window::Window;
 use winit::window::WindowId;
 
@@ -44,16 +47,16 @@ pub struct App<'window> {
 static CUBE_OBJ: &str = "
 # Blender 4.2.3 LTS
 # www.blender.org
-mtllib cube.mtl
+mtllib untitled.mtl
 o Cube
-v 1.000000 1.000000 -1.000000
-v 1.000000 -1.000000 -1.000000
-v 1.000000 1.000000 1.000000
-v 1.000000 -1.000000 1.000000
-v -1.000000 1.000000 -1.000000
-v -1.000000 -1.000000 -1.000000
-v -1.000000 1.000000 1.000000
-v -1.000000 -1.000000 1.000000
+v 0.645975 0.645975 -0.645975
+v 0.645975 -0.645975 -0.645975
+v 0.645975 0.645975 0.645975
+v 0.645975 -0.645975 0.645975
+v -0.645975 0.645975 -0.645975
+v -0.645975 -0.645975 -0.645975
+v -0.645975 0.645975 0.645975
+v -0.645975 -0.645975 0.645975
 vn -0.0000 1.0000 -0.0000
 vn -0.0000 -0.0000 1.0000
 vn -1.0000 -0.0000 -0.0000
@@ -82,6 +85,7 @@ f 8/8/3 7/9/3 5/10/3 6/11/3
 f 6/12/4 2/13/4 4/5/4 8/14/4
 f 2/13/5 1/1/5 3/4/5 4/5/5
 f 6/11/6 5/10/6 1/1/6 2/13/6
+
 ";
 
 impl App<'_> {
@@ -103,10 +107,22 @@ impl App<'_> {
                         ) {
                             Ok(obj) => obj,
                             Err(e) => {
-                                error!("{e}");
-                                panic!()
+                                error!("Failed to load Pumpkin.obj: {e}");
+                                // Fallback to CUBE_OBJ
+                                let fallback_obj = CUBE_OBJ.to_string();
+                                tobj::load_obj_buf(
+                                    &mut fallback_obj.as_bytes(),
+                                    &LoadOptions {
+                                        triangulate: true,
+                                        single_index: true,
+                                        ..Default::default()
+                                    },
+                                    |_| Ok(Default::default()),
+                                )
+                                .expect("Failed to load fallback CUBE_OBJ")
                             }
                         };
+
                         let (combined_vertices, combined_indices) = parse_obj(&obj.0);
 
                         wgpu_ctx.add_model(&combined_vertices, &combined_indices);
@@ -121,10 +137,10 @@ impl App<'_> {
                         );
                         info!("Main window created: {:?}", window_id);
                     }
-                    Err(e) => error!("Failed to create WGPU context: {:#}", e),
+                    Err(e) => error!("Failed to create WGPU context: {:}", e),
                 }
             }
-            Err(e) => error!("Failed to create main window: {:#}", e),
+            Err(e) => error!("Failed to create main window: {}", e),
         }
     }
 
@@ -153,6 +169,7 @@ impl App<'_> {
                 winit::keyboard::KeyCode::Escape => {
                     self.spawn_child_window(event_loop);
                 }
+                winit::keyboard::KeyCode::F11 => self.toggle_fullscreen(window_id),
                 other => error!("Unimplemented keycode: {:?}", other),
             },
             _ => debug!("Received a keyboard event with no physical key"),
@@ -182,6 +199,23 @@ impl App<'_> {
             warn!("No window context for toggling background: {:?}", window_id);
         }
     }
+    fn toggle_fullscreen(&mut self, window_id: WindowId) {
+        if let Some(ctx) = self.windows.get_mut(&window_id) {
+            let is_fullscreen = ctx.window.fullscreen().is_some();
+            let fullscreen_mode = if is_fullscreen {
+                None
+            } else {
+                ctx.window
+                    .current_monitor()
+                    .map(|monitor| Fullscreen::Borderless(Some(monitor)))
+            };
+
+            ctx.window.set_fullscreen(fullscreen_mode);
+            debug!("Fullscreen toggled for window: {:?}", window_id);
+        } else {
+            warn!("No window found for fullscreen toggle: {:?}", window_id);
+        }
+    }
 
     fn spawn_child_window(&mut self, event_loop: &ActiveEventLoop) {
         if let Some(main_ctx) = self.windows.values().find(|ctx| ctx.is_main_window()) {
@@ -213,7 +247,7 @@ impl App<'_> {
                                 let mut tmp_path: PathBuf = env::temp_dir();
                                 tmp_path.push("cube.obj");
                                 if let Err(e) = fs::write(&tmp_path, CUBE_OBJ) {
-                                    error!("Failed to write cube OBJ to temp: {:?}", e);
+                                    error!("Failed to write cube OBJ to temp: {}", e);
                                 }
 
                                 let load_options = tobj::LoadOptions {
@@ -228,7 +262,7 @@ impl App<'_> {
                                         wgpu_ctx.add_model(&cube_vertices, &cube_indices);
                                     }
                                     Err(e) => {
-                                        error!("Failed to load cube OBJ from temp file: {:?}", e)
+                                        error!("Failed to load cube OBJ from temp file: {:#}", e)
                                     }
                                 }
                             }
@@ -242,10 +276,10 @@ impl App<'_> {
                             );
                             debug!("Spawned new child window: {:?}", window_id);
                         }
-                        Err(e) => error!("Failed to create WGPU context for child window: {:?}", e),
+                        Err(e) => error!("Failed to create WGPU context for child window: {}", e),
                     }
                 }
-                Err(e) => error!("Failed to create child window: {:?}", e),
+                Err(e) => error!("Failed to create child window: {}", e),
             }
         } else {
             error!("No main window found. Cannot spawn a child window.");
diff --git a/engine/src/main.rs b/engine/src/main.rs
index 741b460..00ad1d7 100644
--- a/engine/src/main.rs
+++ b/engine/src/main.rs
@@ -46,13 +46,29 @@ async fn main() {
     
     info!("Type 'help' for a list of commands.");
     let repl_thread = std::thread::spawn(|| {
-        let rt = runtime::Builder::new_current_thread()
+        let rt =  match runtime::Builder::new_current_thread()
             .enable_all()
-            .build()
-            .unwrap();
+            .build() {
+                Ok(rt) => rt,
+                Err(e) => {
+                    error!("A fatal error has occured: {e}");
+                    std::process::exit(1)
+                },
+            };
         rt.block_on(core::repl::input::handle_repl())
     });
-    core::render::init_renderer(event_loop);
+    splash::print_splash();
+    info!("Type 'help' for a list of commands.");
+
+    match EventLoop::new() {
+        Ok(event_loop) => {
+            core::render::init_renderer(event_loop);
+        }
+        Err(e) => {
+            error!("{e}")
+        }
+    };
+
     if let Err(_) = repl_thread.join() {
         error!("REPL thread panicked");
     }
diff --git a/flake.nix b/flake.nix
index b51f286..99f0a07 100644
--- a/flake.nix
+++ b/flake.nix
@@ -48,6 +48,12 @@
         packages = {
           inherit (pkgs) zenyx;
           default = pkgs.zenyx;
+          windows = let 
+            pkgsCross = import nixpkgs {
+              system = "x86_64-linux";
+              crossSystem = nixpkgs.lib.systems.examples.mingwW64;
+            };
+          in pkgsCross.callPackage ./default.nix {};
         };
 
         devShells.default = pkgs.mkShell {