limbo pass

a little game, limbo on a mountain pass

run the game

build / run with the release flag so the overworld theme loads on time :)

cargo run --release

run on the web (WASM)

First, install the WASM target and wasm-server-runner:

rustup target install wasm32-unknown-unknown
cargo install wasm-server-runner

Run from the project root:

cargo run --target wasm32-unknown-unknown --release

This will automatically start a local web server and open the game in your browser.

Note: The game is not available on mobile or touch screens. A message will be displayed instead.

deploy to cloudflare pages

The build script will automatically install required tools if they're missing. To build for production:

./build.sh

This creates a dist/ directory with all the files needed for deployment, including:

• Optimized WASM binary (under 25MB for Cloudflare Pages)
• JavaScript bindings
• Assets (audio, fonts, GLTF scenes)
• HTML and supporting files

# if not installed -> npm install -g wrangler
wrangler pages deploy dist

Local Testing

To test the production build locally:

wrangler pages dev dist

Debug Builds

For faster iteration during development, you can build in debug mode:

BUILD_MODE=debug ./build.sh

gameplay

The game features a loading screen while assets load, followed by a menu with a "head to limbo pass" button to start playing.

wander

• space bar
• ← ↑ ↓ →
• w a s d

look

• hold ctrl and move the mouse to orbit the camera around the scene
• scroll to zoom
• secondary click / right click for a slow camera pan

audio

• Click the "music" button in the top-right corner to toggle background music on/off

about

• limbo pass was written with rust, bevy 0.17, and the amazing bevy plugins bevy_kira_audio, bevy_rapier3d, and smooth-bevy-cameras. the scene was modled in blender 3.2.0 alpha
• the overworld theme was made on an op-1, using the the deep space string synthesizer and tombola sequencer - then post processed with ffmpeg. if you just want to hear the theme, it's also listenable on soundcloud
• the game is optimized for desktop browsers and is not available on mobile or touch devices

why

mostly this little game was me figuring out how to use blender assets in bevy and then how to make the ghost's movement respect the surfaces of the terrain. i drew a lot of inspiration and owe a lot of lightbulb moments to the @sdfgeoff projects blender_bevy_toolkit and blender_bevy_top_down_space_shooter.

blender

some details on implementation on the blender side. in case you're curious or looking for examples of how to do this sort of stuff yourself like i was at every step of the way.

• the scenes used for this project live in blend/limbo_pass.blend and are exported to assets/gltf/limbo_pass.gltf
• this project gets both scenes and the terrain mesh by name so make sure you keep track of those :)
• the ghost's origin is somewhere near the object's center of mass but I toggled it a bit. on the bevy / rapier3d side, the scene shares a transform with a sphere collider and because the ghost's shape is irregular it needed a bit of adjusting to match the collider's vertical area
• i ended up doing some... cursed looking things i probably didn't have to to get the terrain's vertices and indexes for the trimesh collider, if you can point me at a better solution I'd be glad for it :)
• i left this commented out in the main function, it was very helpful when developing colliders to see them rendered .add_plugins(RapierDebugRenderPlugin::default())