Interesting graphics, good music, insane.
I really enjoyed the Sonic Hedgehog music, definitely a plus. I thought the graphics were really cool too. I thought the number of enemies on screen was fine, but one you lose a life its basically game over because you have no way of killing those big green ships and the blue circles with the base weapon.
Work on giving people who just died a chance of getting the stronger weapons and this could be a pretty cool game.