Looks great, sounds great.
But most importantly, at first I expected this to be a very basic game that's just pretty. I was really surprised how much you managed to squeeze out of this concept - especially moving blocks in real time makes it much more engaging.
I found a small bug - if you let the note go out through the floor (maybe also other places), you cannot get the note to appear again. You have to skip the level at that point I think.