The atmosphere is very
nice in this game, but I'm not a big fan of the controls. They seem a little too laggy and unresponsive.
I would love to see this broadened into more of a mission-based game with larger levels/goals. I think that would be sweet. Then again I guess I'm just not terribly big on "survive waves of enemies on a single screen" type games. I like feeling like I'm accomplishing something a little more tangible in games, but that's totally just my opinion.
By the way, are these graphics yours? If so, they're pretty friggin badass