I was starting to wonder where the game was going, with no points on screen or any sign of progression other than increase in diffuculty, but then was surprised at the end when the game played back the results as a song! That was really cool! Love the idea and it's done well.
If you choose to continue working on this, besides some more songs, my suggestion would be some kind of visual cue to show which block/ghost block is currently active, as it gets a bit jumbled up when the game speeds up.
Great work!