You just no-clipped into the backrooms W/A/S/D to move around Left and right arrows to turn - Laggy when resolution is lower than 16, but looks better - Turn down the volume, as the music makes a weird high-pitched sound that is very loud (probably will be fixed)
Thank you @griffpatch for the raycasting tutorial. Will most likely update this soon, so give me some ideas in the comments please :] There are no entities... yet