cool
Shiny graphics!
Did you do all the backgrounds yourself?
They were pretty neat.
Music was catchy as well, and the game was reasonably challenging on wave mode, though the final boss defeated me, just barely.
My only complaint is the lack of a score counter.
Doesn't that defeat the replay value?!
Also, mute buttons are always good, though I personally wouldn't need one here.
I guess it's pretty hard to make a traditional shooter that appeals to a lot of people, so good luck if ya plan on making more similar games.