I was thinking about how the zombie games all involve killing zombies and not controlling them. So I was thinking maybe like a mix of RTS and first person shooter that rotates players in controlling the zombies one at a time and the others try and survive the swarm. Think like this: the game will have 4 players. one of them will control the zombies and the other 3 will try and survive the mob. the guy controlling the zombies will switch into different zombies and chose an action to make like crawlling or walk silently as examples. The match ends when all 3 survivors die or time is out. then another rotation starts.