LOW FPS (Horror Action) HUGE MAP

somewhere in Thailand ? you wake up in the hell of storm smell of blood all around you know they coming they come from hell and wanna eat flesh with chilli pepper and lime juice they don't stop even how many bullet you put to them yeah all of them hard to kill not like normal this is my first large map i want to put more enemies if it can run you have to find the way to escape or press P to cheats rpg and tank =_= but don't try to use it they will die so easily in explode and it not fun challenge (Low settings request)