A interesting concept, however it doesn't work too well. It requires a lot of planning out ahead and being conservative with your ammo. Especially as it seems to only kill zombies close range with pistol or it could be because the first few characters have low accuracy with guns.

It could be I suck at strategy, but most I am fine unless the game has broken AI like The Bureau: xcom unclassified. Best to keep using environmental things as a way of killing huge groups of zombies without using up all your ammo. This game has potential and the story is rather interesting, but it falls due to the difficult situation. A far more interesting version is Dead State which I look forward to, plus it's turn-based. I'd suggest waiting for that game if you want a strategy involving zombies, although this one is real-time and not turn-based.