Cool concept, the fact that the music gains an instrument, each time he beat a mini game is pretty cool. I would polish the level design, because the house feels a bit too big and empty, with unnecessary rooms.
A bug you could fix is to allow the player to get out of a mini game, because you can repeat them if you miss click.
Overall cool idea, and I'll be looking forward to see it gain life with a little more polish.
Good job!