I see a lot of potential in this idea, I hope you develop it further after the jam :)

A unique concept for the game. Something about the term 'Piano Battle' is oddly satisfying. 

At first everything is very confusing, but then when it becomes clear the game starts to fascinate.

maybe a little confusing . i think Idea is great but not have enough polish , but other then that great job

I did not find it particularly fun, but it is well executed and the graphics are certainly 1-bit.

cute concept with fun character names, i like the remix stages where you get to jam your own little songs, makes me think of parappa