well...
graphics: 9 pretty good, I havent seen such a good drawing of a full scale human in a while,
style: 5 therse many games that have the same concept of this game, like the Zombie Horde series or Turret Defense
sound: 6 the gunshots where above average, and the zombie-death sounds made the game seam realistic
violence: 10 blowing zombie's heads off with revolvers and shotguns V-^_^-V 'nuff said
interactivity: so many controls, so little time, you can move up and down, shoot zombies anywhere (legs, body, head) without having the very same effect as all 3
humor: 1 the fact of shooting fat zombie kinda funny :P
overall: 8 a good game, but after you play if for 2-3 times it gets kinds boring because its so repetetive