It's okay...
It's an average game but if tweaked enough could kick major ass. The game moved so slow that I got bored after the third level. The controls are sluggish and the weapons are too weak. You gotta make the enemies have less health and more speed. Or better yet make a crapload of zombies just pour into a room and you have to fend yourself till the helicopter comes in or something, you need a story, it be alot more interesting with a story. Also more weapons be nice too like maybe a flame thrower or even a sub-machine gun, more is always better. Maybe like 2 or three more characters with different abilities. Just a couple of ideas but hey it'd make your game kick ass and I'd be giving it 5's all day. But it's your game and you can operate it whichever way you please.