I have made a few small additions to the game (download link is still the same). there are now 2 weapons, a pistol and a sub machine gun (which you need to find first). the zombies are now smarter and can move around the buildings without much trouble. there are higher resolution textures (the original contest entry had to be smaller than 10 mb so most of the textures were compressed). there is a new occlusion culling technique which should improve the game's performance a bit. a few other tiny additions and bug fixes which I cannot remember.