Great game! This is a fun fps which is hard for me to find in a flash game. Graphics are cool and the enemies are interesting and varied so you don't feel like you're killing the same thing over and over.
I found a glitch on maybe the 3rd level I was able to jump outside the level lol. For some reason I cannot play this game on Google Chrome I get an error message before I can play when the story is starting. So I just play on Explorer.
So anyway I think the only thing which would be really cool for this is to add some kind of replay value like a survival mode where you try to get a higher score than others.