Use WASD to move, and the left and right arrow keys to turn. Explore the tiny 3D environment @Argon26 made, in an engine that actually works. Everything might be in low res, simply to reduce lag and have it look like a 90 FPS game.
None of the ray casting or anything besides the laser is mine, the credit for that is to the original creator, @Argon26 Press space to fire the laser. This is intended to be a shooter game.