Fun game, would feel a bit better if, when you overcharge for a jump, it wouldn't stop the jump, but instead wind the power back down. Couple of bugs, but nothing game-breaking.
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Ah, of course. After you jump into a wall (such as the floating platform in level 2), and you try to jump the same direction again, you just jump up instead of going in that direction (when you jump the other way, it fixes itself again). And I once jumped into a wall and stayed halfway up, also being able to jump from there. It's also possible to wall-jump :p