That's a pretty cool game! I'd recommend removing a few of the early levels as its just the same thing over and over, I almost called it a day thinking it doesn't change but luckily I stuck around. I threw in the towel at 21 as it seemed to loop back through the same stuff but in the other direction.
Just needs a bit more variety if you plan to continue developing and try to make the sound it emits to be more core to the music.
Also I found a bug (I presume it wasn't intentional), as you're just checking if circle x is in the right position when the top bar reaches the icon, the player can tap the rewind key immediately after its registered and get two yes's for the price of one.