I like the idea and the outfit of this minigame.Also the song.Perhabs you can animate the modells better,then it will be perfect.What's about a little Lasershow?
That's look like it does, when I play it: they don't change there animations when the arrow keys are hit correctly.
Suggestion: They should make a special animation by _each_ arrow key. If the player hits the wrong key, there a "wrong" sound appears and, maybe, a green light. If the player hits the right key, it generates a nice particle effect.