Wow, that's very nice! Rhythm Heavens are among my favourite games ever!
You've nailed the rhythm input, that is an incredible achievement in itself!
The second stage is very tricky. You've tried to reduce the confusion with the tutorial, but I think this tutorial makes it even more confusing (not sure how to make it better though ¦3). Also, the stages felt a bit disconnected from each other (like they tried to be connected, but couldn't find a way to do so), and I would definitely love to see the remix stage!
Graphics, music, and sound effects are amazing as well. I like all the small details, like in-rhythm animations, and bunny bumping into the screen.
Good job!