Work on it
The keys work, but obviously it needs some work done.
The whole thing runs kind of jittery, like the scrolling of the notes jerk forward between beats. Try to smooth that out so it runs fluidly.
Music and sound, but you already know that.
Try to enhance your game over screen, start screen, and health/score keepers. This is all pretty obvious just because what you have is only a very rough test run, but I hope to see improvements in the future.
Maybe a more original name too, just to set yourself apart while hinting at the relation of the 'hero' games. Keyboard Hero or something, I don't know.