I really respect you for publishing your game when you know that you couldn't completely get around the theme !
Overall you still took the time to polish your main mechanic with VFX and SFX so it feels pretty good shooting around. One thing you could do to improve the controller would be to make the camera look at the direction your going to, let me explain:
When turning left, the camera is following behind the player during the turn, then adapting it position to look in front of the player. I think the camera should instead of following, be looking directly the direction ahead. That would feel better when taking turns but also when diving down/going up.