The silhouette of the dancer sometimes hide a bit the instructions ^^' They're fortunately quite simple!
(and please think about players having a non-QWERTY keyboard :D)
A little more feedback would be great: I've tried to hold anything but good keys and it I didn't loose, I only had some screen shaking ^^' I also didn't undersant what the progress bar is supposed to mean.
That's said, when playing it seriously the game is very relaxing: the music, the dancer peforming great and the effects when we're doing right are very nice!