Good but not enough improvements
It's a fun game but there doesn't seem to be any obvious upgrades from the first game. The zombie models are the same as well and the weapons are unchanged. The first game was good yet there is clearly not enough improvemets. Sure it is much harder but there isn't enough to make this a stand out.
While at the time of writting, this is still under judement. However, I can not stress the importance that more things need to change in order to make this a very sucessful series. Next time, add more game modes, new weapons, diffrent zombie graphics and change the gameplay as this is very similar to other zombie survival games here on Newgrounds