You should make the player rotate towards the mouse, or make him rotate in 2 directions, because rotating the player for more than 180 degrees was very tedious.
The effects are pretty cool, but you might want to tone them down a bit.
Punishing the player for getting the powerup (the minus - health) is not really good, because the player went out of their way to get the powerup before it despawns just to get punished, which is frustrating.
No music :(
Respectable submission.