Insulting
Frankly it is insulting that the score counter in this game goes so high; who would waste that much of their time playing this?
I got my score up to roughly 500,000.
* * * GAME SPOILERS, BE WARNED, YE INNOCENT EYES * * *
All of these are related to the first level, which is the only one I tried and the last one I ever will as I find this game boring and intolerable.
The pistol in the beginning... well, blows, but hey, the default weapon always blows.
Then you get the Uzi, which is just a fast pistol.
Following that, you get the shotgun, which is supremely useful for a while.
Until you get the barrels, and then you can just plant barrels, wait for the zombies to stack, and blow it.
Then you get grenades, which means now you can throw explosives. Just great. Bye bye challenge.
After that, you get mines. Now you can just camp the enemy spawns and drop mines in front of them.
Finally lucky number seven, the rocket launcher. As soon as you get the fast upgrade this game is pretty much over. You could just stand in a corner and fire away with no worries. In fact, if you stay in the middle, you can just chuck rockets to your left and guarantee kills with no danger to yourself.
And then the railgun, oh, the mighty railgun... a gun that can fire through walls! Amazing!
I assume that as time goes on more weapons gain infinity status (as in infinite ammo)... as soon as the shotgun gets the magic horizontal 8, things are practically a cake walk... soon as the rocket launcher does, it IS a cakewalk.
* * * SPOILERS DONE, YOU CAN STOP CRYING NOW * * *
All in all this game was mediochre at best and not terribly entertaining in the long run. In the short run, it is good for killing five minutes, but since you obviously planned for people to score in the billions I assume you think that they will spend a great amount of time with this.
They won't.