Good game, needs more players and (this is very rare in games and takes alot of loading power but) an infinite map. That would take gameplay to a whole new level and make everything insanely fun. You would have to plan carefully and put real effort into each attack and plan. Also, this would be a great long term game if you take off the five day limit.
oh hey a zombie has a weapon cool cool.... wait what? its going to stab me? eh ill just stay here until my boss kills it for me. and then after the attack lets just leave those weaponson the ground because you know zombie cooties.