I quite like it. Even if it's very generic gameplay, I think the concept is sound and the artwork is nice. Could DEFINITELY use a "quality" button though. Screen gets pretty busy, and my little netbook only goes so fast. Oh and the music kicks ass. 4/5
It's got some promise, but you really need to fix some things; headshots should do a lot more damage (some kind of reward like a 1-hit kill would be nice) and you should make it so that opening the menu pauses the game, just for starters.
A few little bugs, and some questionable design but once those have been dealt with, this should be worthy of badges! For example, a lot of the time the buttons in the upgrade screens seem to be treated as "behind" the objects they've popped up over, meaning I click on "Promote" and end up selecting a lift. Minor qualms which don't take away from its spirit; just needs a little work. 4/5.