Still a little too difficult...
I enjoyed the game, but it was frustrating at times. I did manage to beat it, but honestly, I felt like I was lucky to get through the last two mini-games. I certainly wasn't in control. If you want to leave the difficulty for more skilled gamers, perhaps you could add an option of 'Normal' and 'Hard' modes? I was also disappointed to find out I'd need to beat the game again in order to hear the final song.
On the plus side, the games were generally well thought out. It was great to hear the song coming together as I progressed through the various mini-games. I also liked the graphics and music (including the song that goes with the credits). If it catered to different skill levels I think it'd be really great.