Vibe coded a 16 KB FPS game as an experiment

I wanted to see how far I could get by vibe coding something that normally takes deep demoscene knowledge. Ended up with a small FPS that fits in 16 KB I used Fable 5 High for the initial planning and Opus 5.5 High for implementation, polishing and optimization The game: You’re blind, underground. Your scanner fires sonar pulses at three frequencies. A pulse briefly lights up walls and enemies, then the map fades back to a faint trace. Every pulse is also noise, and everything down there hunts by sound. 3 levels, 3 enemy types plus a boss, pits and bridges, generative music Optimization techniques: * The level is a 64×64 cell grid, ray-cast in the fragment shader (2D DDA). That freed \~430 bytes, which then paid for pulse shadows, fake AO and procedural wall patterns * Every frame the CPU rewrites one float texture (64×90 RGBA32F). It holds the cells, the enemy list, the pulses, the lamps, the HUD text and even the font bits. The camera’s yaw, pitch and aspect ratio ride in on…