Really cool menu and presentation, the graphics were really nice. I also enjoyed the way the keys popped off.
That said, the gameplay itself was a little bland. After a little bit, it was just like I was hitting random keys. I think it could have benefited from some kind of other element, like having to spell words or something. And maybe include a penalty for hitting a key that wasn't turning red. Otherwise, you could just go crazy on the keyboard, and successfully restore a key without seeing which ones needed it.