UNDERRUN
Reboot a darkened facility's systems while spiders and sentries hunt you.
Desktop recommended — this build is played with a keyboard.
About this build
UNDERRUN is a 2D twin-stick shooter. Setting: underground facility. Style: dark pixel art. It runs entirely in the browser and loads no account, no install and no runtime model call.
- GENRE
- twin-stick shooter
- SETTING
- underground facility
- STYLE
- dark pixel art
- PLAYERS
- single player
- INPUT
- keyboard + mouse
- LICENCE
- MIT
Why it's on the shelf
A 13 KB top-down shooter with a facility to reboot and enemies that punish standing still. The whole game fits in a few files, which makes it a useful reference for how far a tight loop can travel.
How to play
WASD or arrow keys to move, mouse to aim, hold left mouse to shoot. Click the frame once if the game needs keyboard focus, and use the fullscreen button above for a bigger view.
- twin-stick shooting
- system reboot objectives
- enemy combat
- darkness
Paid service
Change the theme, the twist, or the whole brief
The build above is the shelf version. If you want it re-skinned for your brand, retuned for a different audience, or extended with new mechanics, we quote each job by hand and deliver a new standalone build.
- Re-skin — palette, sprites, audio, logo and end screen.
- Retune — difficulty curve, level length, controls, mobile layout.
- Extend — extra enemy types, modes, scoring, save data.
Paid exports and rebuilds are in development. Nothing is charged yet — browse and play the shelf while we finish the request desk.
Source and licence
This build is adapted from https://github.com/phoboslab/underrun, made by Dominic Szablewski and released under the MIT licence. The licence text ships inside the build folder.
UNDERRUN by Dominic Szablewski
Build checked in Chrome on 15 Nov 2026. If it fails to load, tell us.