I liked the idea of this game! It was absolutely terrifying to see these low poly zombies charge at you! One thing: the zombies on the second floor didn't move for me ( I finished twice, same problem). Also, the 'bug' where the guns go inside the walls, you could fix this by using two camera's: one for the world, and one for the weapons exclusively (and put the one camera in front of the other). Maybe do some googling on that, it's pretty easy! Good little game, I think you should keep working on it :)