I loved this entry, one of my favorites in the jam, I would just point that the trigger area was not very intuitive to assign, at first I thought I should press the key when the notes where inside the bubble shield, later I noticed the white dot.
Also some stuttering when playing for the first time, I have those in my game too and I'm yet to fix them but I think it's related to particles loading on web exports, maybe a solution is to emit them while the scene is loading, I'll test some things when the jam is over.
Congrats on your entry!!!