Very polish visual and menuing, good music too.
I was a little bit confused by what I had to do, I read the tutorial, but I still had some trouble understanding. I think the arrows on the note coming at me was what confused be the more, I thought they would help me know what direction to hit, but they don't. I think having some sorte of indicator to tell you what you'll need to tap is required, else you leav your player doing some live calculation at all time and it ends up being a frustration when you fail, cause you don't know why.
I think this has potential, it only need to be a little more clear. Keep it up!