There really is no limit to the spin speed is there?
I beat the game. I agree with what Pixeator Gadzy said -- I started feeling pain in my hand during the final battle. Games where pressing buttons faster means you win faster cause me pain.
Honestly, I'm not sure this is the best idea/concept in practice. Taking away the player's ability to aim often results in a bunch of waiting or random shots (depending on the rotation speed), neither of which are things I want in a top down shooter. Your game wisely sidesteps this issue by being more of a bullet hell / maze game with shooting elements, but... that just sidelines the theme.
I just don't think it's a good idea for a game. And with that said, you knocked the actual implementation out of the park. Music was good and fun, presentation was simple, readable, and often funny, and the level design (as mentioned above) sidestepped most frustrations with the theme implementation. I enjoyed this beginning to end.