This one takes almost all stars from me! The concept is super interesting, and the execution feels supremely polished. All art looks amazing, and the audio part is also superbly done. Level design is a bit below 5 starts though, as the levels usually don't require any thinking from the player and more often than not (since by the time most mechanics are properly introduced just a few levels are left), simply involve timing jumps. Besides that though, which by the way is fully expected from less than a week (in fact it's more than I expected), quite literally, the only piece of feedback I have for this game is the controls- why, just why arrow keys :P
But in all seriousness though, making the jump Z seems like a pretty arbitrary decision. It would make sense if this was a 2-player game, but this isn't.
Other than that though, perfect game! Good job to the team behind it.