This, my latest survival-ey RPG, is by far the best: It has a definite cooperation aspect (all resources are shared), it allows building, and there are upgrades (think zombie castle defense)!
Pictures:
The upgrade screens:
The food mat (where food goes):
Where you get w.p (work points):
Some stuff on the beach (the spawns are where the zombs spawn):
Where you spawn (push a button; sets up all the events):
Where the zombs come for a raid:
