The music is beautiful and I like how different colors have a different type of instrument for the same tune, making it sound unique. However, you should let everyone know that pressing shift changes the way the music sounds and you also need to show when I go through a certain color so that I don't have to keep track of whether or not I finished everything. I'm not sure if the game has an infinite loop or I missed something so I just left it after a while.
PLEASE add at least one achievement to this game! It would be awesome adding points so that people could level up and it makes me feel like I've accomplished something when I get achievement points for completing a game on here. :)
Click on the paper or press "E" when the cursor is on the paper. It shouldn't freeze. If it does just hit "refresh".