Weird thing I encountered was that I needed to run the game as administrator for it run. Might just be because im on windows7 but thought I would let you know. On 1-13 you have a red portal, I thought it was an enemy for a while and tried to avoid it. Maybe don't have red portals since they look pretty similar to the regular enemies. Assuming this game is made with a gamepad in mind so the default keyboard controls were a bit weird to use. I think adding a restart button on the pause menu would be nice since I found myself replaying some levels to get S or perfect and it was a bit annoying having to go back to level select everytime. Everything else is pretty amazing, had tons of fun playing the game, feels like a professionally made game, and I love the art direction. I thought the background would be annoying looking at the screenshots but turns out it blended in pretty neatly and never bothered me at all during gameplay. Everything just runs and plays super smoothly can't wait to play the full thing.
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Mainly the A,S,D keys. Might just be a bias from other game that use arrow keys to move but felt it would be more appropriate at Z,X,C or Space bar, not exactly a big deal since you can rebind the keys. I think it would be a good idea to mention the key needed to be pressed for the in level tutorial like the one on 1-1 where you tell the player they can jump but not the key needed to use to jump, since I imagine most players will just jump into playing the game rather than checking the tutorial or settings page first.