Nearly perfect!
This game belongs among the best games at Newgrounds! Everything about it is perfect. I only found 1 little insignificant glitch!
Graphics: Excellent. It's graphics aren't fantastic, but neither bad! It's perfect for those with a slow computer and great for those with a fast one. Heads exploding, legs breaking....If this doesn't deserve a 10, I don't know what does.
Sound: Could have been a liiiiiiitle better. FE: Putting more zombie sounds or maybe you should have let your team talk too! But still, the sound is awesome! Good job.
Violence: ....what? IT'S A ZOMBIE GAME!
Humor: A survival game usually doesn't have any humor, but you put some stuff at 'Note to Self' and the weapon menu that were quite amusing.
I just found one glitch:
At most of the weapons, you can shoot before the reloading sequence.
At weapons like the shotgun or the final...totally awesome weapon, it makes it easier for the player....but...
At Automatic weapons, like the AK and the M4, you can do it too. Only this time, it doesn't hit the zombie before it's done reloading. So you'll be wasting tons of bullets if you hold in the mouse button.
Overall:
BEST GAME EVER!