Cool game, I love FFR! The animations are really slick.
I think the user interface needs some work though. The feedback you get when hitting arrows is not very clear - the "good", "great", etc should probably be color-coded and appear somewhere more visible on your section of the screen. The colors of the arrows also make them hard to see against the similarly colorful background - perhaps when it's your turn your side of the screen should darken or something. Finally, during the tutorial it was not immediately clear that only one player was me and I was only supposed to hit arrows on one side - I think that needs to be pointed out more clearly.
Looking forward to see what else you add to this!