Nice game.
I wasn't sure about the difference between the purple and the green enemies and assumed the green ones were the target.
I also noticed that ship health and time appeared to regenerate, but wasn't sure why.
Due to the controls and the number of objects that fly in towards the ship, the game is challenging. I think it could do with a little more info on what you are supposed to aiming for, and how you can keep the time and ship health up.
I like the art style and the shooting noise. The way the bullets have a glow to light up areas you can't see is a nice touch as well.
Thanks for the game.