It's nice to see rythm games in the jam. Obviously the music is the best part of the game.
However, when the music really starts to play, i often had the problem if i didn't press the right keys, i just hit the wrong keys over and over again and the game was over quickly. But maybe it's just me.
Despite that, i had a lot of fun playing your game. The pixel art and animation is very well done. Good job.