Woohoo!
Also, I came here from the CoolMathGames version being completely terrible (too fast of a timer to do anything) and I'm glad I found a version that works. Great job on the game!
No it does not. There is actually a secret level if you beat one of the hard songs with an S rank. I'll leave it to you to find which song it is :)
Stay classy,
TheGames4Meh
Woohoo!