Eh... Not too good at all. Sorry.
Already hundreds of these types of games, yours isn't any different so there's nothing special about it. Whenever a new upgrade or ammo comes, the horde of zombies are on it so you'll be lucky if you can even get it. Could be and MUST be improved greatly.
I think the next one, or the fourth one [if there's going to be one] should have multiplayer. It'd work something like it did in this; you'd find survivors and they'd instead be actual players. And when searching places, you could choose to search as a big group, small groups, alone, etc. +++ this if you agree.
Am I the only one with this problem? Alot of the time, and this isn't the only game, the arrow keys either don't work or always make me go one way or another. Like, I press right, it will keep going right and not stopping. Please post the answer on my page if you know what's up..
 "The most 5star rated game about cats sitting on tables"){kind=icon}
 "Arise and Die Again"){kind=icon}
 "The Last Stand 2"){kind=icon}
 "Gateway II"){kind=icon}
 "Cell Warfare"){kind=icon}
 "Exploit"){kind=icon}
 "Pwong 2"){kind=icon}
 "Monsters' Den: Book of Dread"){kind=icon}
 "Pongnop"){kind=icon}
I'll try to make these changes in the next game. Thnx for the feedback :)