This one's really nice. Evocation of bullet hells without the overwhelming complexity off the bat. I did wish for a little more focus on maneuvering - before Level 6 all I was doing was holding my speed to slow - but everything else was pretty exceptional once it got going.
I love the way you evoked tate mode with the screen orientation, though playing it in browser does carry some risks of going off the side. Are you aware of the arcade game Space Fury? That also allowed you to select power-ups between levels in a kinetic way like you are doing here.
Technical tour de force too! Even the off-screen audio works.