Wow, these designs are spectacularly cute! Story makes sense in that extremely cartoony way.
Rhythm games are a ton of fun for me, though in this case my wrist started hurting after a while, haha! I'm sure if given the time it could have controller support and use the 4-button layout. I could totally see this expanded with several more types of rhythm games to break up the levels.
Soundtrack is all bangers!