Nice retro arcade. Pretty good graphic style. Liked it.
I am not sure about the idea, but it seems that enemies should be weaker, so you can shoot 2-3 times only. For example - you can not get on the straight line to shot the "swirly" ship because: 1 - it blocked by meteors in front, and they have alot HP; 2- you can not get too close, because swirls have really close gaps.