Major Issues, Amusing Ideas
So, I'll give this game at least a 4, because it did have a good idea. I also applaud the creator for putting a bit of work into throwing some voice acting at the game.
That's where my complements end, though. While the opening voice acting is amusing, the constant one liners are pointless and irritating. Zombie movies have one liners that change slightly and are amusing throughout the movie. This game contains all of two one liners consisting of an "Is that all you can offer me?" and an evil laugh. Bleck!
The game also has a major memory leak issue. I've noticed that the memory seems to jump the more maps I've visited, which makes me wonder if the maps are unloaded or just stored in memory in the background. Also moving in and out of the same two maps will eventually cause the memory to jump quite a bit too. The game will eventually become completely unplayable with the memory leak causing it to slow down to the point you can barely move, if at all.
The game will also sometimes glitch on reloading the last clip of ammo if you reload too often. (i.e. Reloading every other kill may cause the last clip to become unusable) I've seen this happen with the Desert Eagle and the Uzi so far. The Uzi will also sometimes glitch when you get to 0 rounds and not allow you to gain any further bullets for it when you pick up an ammo pack.
Finally, there's a game stopping glitch at the end of South HQ. In my testing of the game, it seems the glitch will occur ONLY if you have the minigun when you try to leave South HQ. If you try to leave South HQ with the minigun and no key, it will zone you back into South HQ immediately. If you leave South HQ with the minigun and the key, you will get stuck and cannot aim or walk. Reloading, changing weapons, and shooting works fine.