I don't understand people that are saying the control are too hard. I think it's the perfect game to speedrun. I don't have the exact time (might be nice to add it by the way), but I think I made the first sub 1 minute :)
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I feel like there might be some collider logic that isn't working properly. I'm jumping a second time when hitting a different collider, even if coming from under. On the 4 level, I'm really not sure how I double jump tho, but it seem to work when doing it right at the crack between the 2 platforms.
But I wouldn't say it's a bug, it's a feature that speed runner can exploit :P