Wow, im really impressed
Awesome work. Really. This game is nicely finished and you worked up all the details. So sweet :) The whole atmosphere of dead can be feeled, but only at start.
However, it's too easy, when you get some survivors, beacuse it's almost impossible to get beaten with commrades.
It's so good, that ispires pepole to work ;). My ideas to make game amusing afterwhile:
-you could make a hunger problem, so you may need to search for it
-guns should had limited amunition, then game would become really interesting when you're out of ammo and some monsters are attacking
-after collecting more pepole, you could move to other areas, something Fallout-like, then you could buy better weapons in villiages, where other survivors stay
Anyway, it was so awesome, that I give you 5/5 whiout deeper thinking. :)