A cool experiment
Hardly any, to be honest. The game is just a bunch of different levels that are all music based. You can't save, there are no high scores, and there are no objectives. Just make music. That's it. If you don't like the sound of it, don't try it, because you won't. If you hesitate at all about this game, I would not recommend trying it. It's not a game.
Graphics:
Pretty cool. The art-style is unique and fitting.
Sound:
This game has AMAZING sound. I love hooking my DS up to a tv with audio cables, making a little tune, and letting it play. Awesome sound. Each is very unique.
Replay:
If you love music style games, you'll find yourself coming back to this one in leisure time.
Overall:
For music and art appreciation fans only. Nothing rocking or metal, just soothing.