Must Play
This game is awesome indeed.
First of all awesome things...the zombies...there are really many many zombies, differnet size, speed, armor, health...all quite a bit different. And zombie dogs too.
Zombies die in different ways (loosing a leg, different headshots, falling backward or frontward...etc) which is funny and very well done.
Guns are very good, and the gunshots' sound is just awesome.
You can get survivors which are helpful at the begining, but at the end doesn't help too much, although it's good to have them.
Guns-> lots of 'em...what makes any man happy? GUNS!!! yay!
Chainsaw is good for first waves, but then I recomend hunting rifle for longrange, you'll probably get all the zombies before they reach the baricade (if you good). AND THERE IS A BONUS GUN =D you guys will probably find it out sooner or later.
Zombies are good, gradually becoming better as levels increase (for example zombies with more protection like kevlar vests, or zombies with lots of speed).
-MY SUGGESTIONS-
->Make a longer Night 20 with some bosses for more challenge.
->Possibility of a harder difficulty perhaps?
This game is in my opinion a must-play. Graphics are incredible, sound is very nice, and the gameplay is awesome.