I scored 29,400 on a first attempt... I guess that probably puts me in the middle. The game is decent but I got really sick of pressing LL over and over, and honestly the stepchart just didn't seem very inspired to me, not to mention the song was too long. I'd have liked some kind of indicator showing when I hit a note, possibly how many notes I'd gotten in a row, and a playhead to show how close I was to finishing the song.
Worst of all was just that it's incredibly awkward to hold those five buttons. Eventually I got things to work well enough for me by using three fingers from one hand and two from the other.
Honestly this just needs lots of polish. And while the game didn't lag, I feel like it was still off sync by a bit; I found myself using visual clues more than the music. You should put something on screen that pulses to the beat like in DDR.