Anyway another suggestion is to change the lighting and make it a bit more dynamic. I mean like, at the moment the whole map is lit up (unless your on a special level like "The Darkness".) Set objects that emit light, and areas where there are no lights are dark where the player can't see zombies lurking. This would be particularly good in "The Darkness" level and the "Factory Part 2" where the lights go out, have the lights lit up at first but they start to flicker through the rounds and eventually go pitch dark so you can only see with the torch.
Also you should get zombie moaning, attacking and dying sounds too to add realism


















