Hey, really nice game! The premise is great and the graphics are really nice. This is one of the only games so far that I've actually played the whole way through.
The controls really took a bit of getting used to, but once I got the hang of it things went pretty well. I think that my only real criticism is that it seemed really easy; the enemies just weren't enough of a challenge that I ever felt like I was actually in danger, especially with all of the health pickups.
Nice work!