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I think that because the first face of first building doesn't react it would have been nice if it said "Practice" and the displayed keys as you were meant to press them in accordance with the windows and "Jump" when you had to do so.

For the game itself, it was really nice. If the blended in clearer with the music and if the Z,X,C corresponded to different sounds it could be a real hit. Also, of course to start with a song with lower bpm to let people get better while feeling like they are good instead of failing and missing while learning. 

As I said, really enjoyed it! Great work