It gets one star for graphics...
and -4 stars for everything else.
It seems as if you spent a significant amount of time on the art direction, but neglected the game itself.
A) the gun menus sits right on top of the action, obscuring nearly a thrid of the screen. not only is it taking up room, it is literally in the one spot it shouldn't be. sloppy.
B) the action consists of spamming the left mouse button. Nothing else.
C) TEST YOUR GAMES
What a waste of something that could have been decent
Oh, and the World doesn't need another Zombie shooter... or zombie anything. The genre has been done to death, resurrected, and then had a hole blown in it's skull.