Something went wrong because during a mission is says that there is four zeds left, but they won't appear. I've been running around the map five times and found nothing, I'm just about to abort the mission now.
But I really liked the game, maybe too few supplies spawning, and too short time to search the map, it just skips ahead too fast. But it's an alpha so its ok. It looks really good though, just some smaller fixes left.