Very polished and well made. The note hits felt accurate and it was easy to keep up just by listening to the music and hitting the keys to the beat. The camera zooming in and out and moving around was a nice touch, and then when the notes start flying in on a curve it really helped to keep things interesting. All of the chiptune music tracks were excellent too!
I appreciate you adding a hard mode for rhythm game veterans. Now all you need some sort of BitDJ DDR controller peripheral :D