This is a really cool design idea, as a game designer my mind is racing with the possibilities for expansion with this. I think something that could really help though is having percussion that always plays to help get a sense of when my shots are gonna fire. The balancing is a bit off, since the blue notes are so much more powerful than the red and green, and the game gets really hard later because of the floaty ship controls, but I think for a jam submission the balancing works good to make it a short and powerful experience. Really great job with this!