well
the bullets from the guns dont even come out straight they do diagnally when the person is aiming straight, all the zombies died in the same position and had blood in the same positions, The first time they encountered the zombies the bullets from the guns couldnt shoot through their skin but during the fight at the end they could. The music wasnt the best and the graphics could do with some improvements, maybe next time put a little bit of heart into it and spend some time making each one unique.