Quite enjoyable
9/10
but for minor sync issues (when the arrows get thick and there's a lot on screen, it lags enough for the music sync to be an issue, it eventually becomes very difficult to play).
Also, I noticed something very peculiar when I looked away from the game after playing it solidly for about ten minutes. The rest of the screen seemed to be constantly moving to the right, as most of this game is scrolling to the left. It's not the game fault, more the brain's, but I wondered if anyone else had gotten that strange visual distortion after playing for a while.