Well...
This game is a great game, but the fact that if you press "R" and you didn't shoot a bullet pisses me off - especaily if a megahorde is right in front of me - You have a good (Unexplained) concept of a man defending a base, but to tell you the truth at first it's boring, I waited for maybe five minutes for the zombies to come up to me and I killed them like nothing, Other than that, great weaponary system, it's just the "Slowness" of reloading and enemies, other then that, great job. (Expecting a sequal :D)