Pretty good demo. There was really not much challenge though. There is one spot on the map that you can just sit and most of the zombies just can't get to you. The pathfinding needs some work as well because they get caught on walls and doors and can't get to me at all. Would love a pause screen and a manual way to cool off my gun. The bullets from my gun also look like they do not go where I am pointing and I can't shoot without aiming down sights which is weird.