The only real redeeming quality about this game are the graphics. The gameplay is too slow, and the enemies all too easy. Not to mention, they're all the same. The powerups are too limited, and the explosions are cheesy.
This game does have a ton of potential, this attempt just wasn't really up to par. Keep on trying, though, and I'm sure you'll come up with something great, especially with the graphical quality you've obviously got access to.