This game isn't bad.
It's not awful, it's completely playable. It possesses a total absence of suck. But it's nothing special. Its biggest problem is balance. All the weapons are cheap enough to buy in the first few levels, and some of the cheapest are the best--the plasma main and the slasher secondary pwn everything else. You might want to check out Project Monochrome for some good shootemup weapon balancing. Still, that said, this is a perfectly passable game. Nice job.