Lovely graphics, really fitted together nicely.
I'm not sure the positioning is spot on as sometimes I definitely had the block in the right place and it still failed me.
While playing I was concentrating on the bottom of the screen, and just glancing to the top to see my progression in the song caused me to miss a block - maybe the notes counter could be at the bottom?
I did love the bit at the end, replaying the song - that was really nice and a great touch.