Hi there. I got to level 4, but at level 3 and beyond the lag seemed quite heavy. Tried Firefox like mentioned but that gave the same issue. Fun concept, though, just didn't really get to fitting the theme like you mentioned.
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Ah, yeah the method of doing the physics is pretty brute force and just reads the canvas pixels. On my machine it was within a reasonable time but there are many factors that could screw it. And yeah the theme was meant to be there, then fell out, but I still wanted to finish something. :) Thanks for playing!