It would have been nice if you posted screenshots and a link to the zip. Just keep that in mind next time. And tell us about the game a bit, so we know what we are about to download.
Crits:
Graphics:
They are alright, player ship needs a tilt animation when going up and down, 5 frames would be enough, 1 up, 1 down, 1middle and 1 transition frame.
The background needs a lot spiffing up, it's just bland, but i take it you know that.
Music:
Two words: Fucking annoying.
Gameplay:
Powering up like that is a nice idea, but the leveldesign should be so that you can get way more enemies. Half of the enemies can't be killed because you are to slow.
Enemy waves are boring as hell, all in all this is too slow. Needs nice waves of enemies. Also it's not challenge whatsoever. It's very very easy and boring as well.
Needs refinement, but could turn out nice with effort.