So, one thing I don't understand is why the arrow keys to press are "Up", "Down" and "Right", where it could have been "Left", "Down" and "Right"? Maybe it is an intended challenge, but personnally I just thought it makes the beats hard to read, and the controls confusing. Also, sometimes I lost point by doing nothing, I still don't know why.^^'
That being said, the game is just lovely! I really enjoyed its cute atmosphere, its pace, and the little world it creates. The transitions and text animations are also fantastic, giving to the game a very special aesthetic. And even the rhythm game, while a bit flawed, succeeds to be pretty fun.
Overall quite a nice entry. Good job!