A really nice idea, unfortunately I was getting stuck in walls and on switch pillars a little too often and I couldn't always get away :-(  But just add a few more level objects (like lifts or multipart switched) and upgrade the look at bit and you would have a whole game here...

Great concept! I could have done with some indication that 'E' was the use key and it took a while to realise you can pick up crates, other than that it does a pretty good job of teaching the mechanics without text. I had some trouble with the movement, kept getting stuck on walls. There was also one case where I didn't see the edge of a platform because it was in front of another platform of the same color, I imagine this might be a result of the shader issue you mentioned. Overall very interesting though, good job!

Super fun, really nicely implemented and good puzzle design. 

Very good game, one of my favorites.

Would benefit from some kind of tutorial or "how to play". I could not go anywhere else than the spawn point, the button didnt seems to do anything and I would get randomly stuck on walls.

the game feels broken to me, I can't look up far enough to press some buttons, and I struggle moving around