Occasionally when encountering zombies, if the floor of the house is raised off the ground a bit, the zombie will clip through the floor, sometimes rendering it unable to attack the Player, or sometimes rendering the player unable to harm the zombie. There are also many occasions where zombies walk through geometry of walls, shelves, desks, etc. The worst being the ability to teleport to the other side of a closed door. This renders zombies a very unrealistic and overly unforgiving foe. I would rather see more zombies implemented (i know it is coming) than a handful of zombies walking through world geometry.