Cool audio and visuals, but I'm really not sure if I'm doing it right, even after reading the tutorial. I hit the space key during the response portion, and the two bars on the side move towards the center, but it isn't doing anything no matter how closely I hit it to the fourth ding.
Kind of a shame too, since the art and music is pretty good, but please either fix your game if it's a bug or make it more clear next time. =(