This is meant to be played with a Makey Makey piano - this is where the multiplayer and single player modes make sense. The multiplayer mode removes the sharps functionality and re-maps the keys to be three sets of notes C - G. Try playing some sounds in a round with friends.
I removed the crowd expressions and backdrops. I also made the black keys functional, added a couple more keys, and added the ability to save up to three recordings.