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!
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Thanks for playing! I really appreciate the time checking it out :)
Having in-game controls definitely seems necessary, especially for the crates xD. The difficulty with seeing edges is an issue even when the shader works, so that's something for me to look into. I was tossing around the idea of outlining platforms (a.k.a. cell-shading).