I already know this glitch from plenty of gmod back in the days. We though about making a game around it as well at first ^^
Honestly the best entry I've rated so far. The atmosphere is spot on. It feels incomplete without being crude or shoving it in your face. The puzzles are clever and the red/blue walls mechanic is well thought. The music and sounds also compliment well the visuals.
Unfortunately, I couldn't manage to 'Think outside the box' :-)