I like it! Clever idea, really pretty method of "revealing" the world. The controls were a bit sticky at points, as in not turning in mid-air is sort of normal for people to not really be able to do, but abnormal as far as most platformers go. I think I had a few lost frames at various points, likely due to whatever animation was done to reveal the world, but overall, this game was really good. [Edit: Sorry, meant to put my review here.]
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Thank you for your feedback and for testing the mac export! Yeah, performance was a big concern, because my method of revealing the map is very resource hungry.
That you don't turn mid-air was intentional, so you can not wall-jump indefinitely upwards. I can see how it may seem unusual or clunky, though.