Didn´t like it
You will need to reinvent this game, its almost impossible for a person to get a perfect in any music, the arrows system isn´t intuitive, try to use the guitar hero system. The game has only one dificulty level, try to add at least more 2. Its very hard to know if you hit the right or the wrong arrow so try to add something like a litle explosion on the symble when we score.
By the way, no mather how mutch you suck at the music you will complet it, this cause the player to never try again even if he didnt got the music at all, the most interest thing about computer games is that it chalanges the player to the edge and make him better. The game doesnt need to be hard, but the way it is, the players will just play 2 or 3 music and go do other stuff.
Dont unlock all the music at once, try to create levels off dificulties and some arkivments to keep the player interested.
My final advice is that this kind of game is not original at all, but you managed to be a new and interesting concept with nice musics and diferent stuff, the best thing about this site is that we can see diferent, new and realy funny things and in this point you got it right.
I congratulates for the game but try to improve last time. I expect a lot from you.
Thanks for your patience, I hope you find any of my tips usefull