It's okay...in fact, I liek it.
Graphics - Not too 'graphic', but still, it's decent.
Style - It matches, defend something while killing.
Sound - Sorry, seeing that I am hearing impaired, I am not able to rate the sound.
Violence - Guns, bloods, zombies? That's what I call violence, any more reds, I will rate violence higher.
Interactivity - There's not much you can do with the keyboard, since you will be using the mouse/touchpad in the game.
Humor - I find it bit funny that you have to defend the certain things, like defending the bowling trophy from the Nazis.
Overall - Not bad, I see nothing that needs to be added.