I got confused more than once with the levels but I managed to beat the game! :D and what I loved about this game was the music and the voice mechanic. I found myself trying to mach the beat and sing along with the ghost and making my own music. I think that when you find games withing games you have a great design going on.
It was fun to play and the mechanics where easy to learn, I felt that the jumps where a little bit high but that's pretty much it.
Thanks for making this great game! :D