Fun game - many things to like: combination of tactics and rhythm, tone that change based on position lets you create your own melody and fit with the music, challenging but not too punishing.
At first I assumed that you have to move position just at the right time to hit the passing "note" but then realized that I just have to be there before the note comes to hit the "perfect" - IMO that moves the game away from rhythm and more towards "dodge projectiles while gathering powerups". Also consider more visual effects on hitting the note and/or moving.
I thoroughly enjoyed playing, thanks!