Enjoyable Game BUT.
The reliance on the evil Mochi network to save progress (as opposed to actual COOKIES) is very bad. I personally have blocked all and any connections to mochi to spare myself advertising by the bucketload. However, since I've done this, I am 100% unable to reconnect to them to save game progress, perhaps you should look into either: A. not relying on them, or B. Give an option to save in cookie form to play without multiplayer, etc. This is incredibly shitty as I am able to save no game progress whatsoever, and on a very time-muching game like this, that's fucking annoying, to put it bluntly.
THAT ASIDE. Good game, fun to play on end, but a notable glitch with burst fire weapons that it will only do the full burst count if you keep the trigger held. Such as tapping the trigger with an M-16, it can fire only 1 or 2 shots instead of 3.
Overall, 9/10, 4/5. ~WCCC