I thought this game was well worth the money. Id say 4 dollars, Max if your a solo player. I could see a bit more if you buy it with friends.
Very good game with a odd story, its similar to How to Survive with a bit of dead space? For 4 bucks I would totally say get this game, although I am unsure just how much replayability there is, if any.
The story is hectic and would make no sense, its good writing but what government lets a third party spray "Gas" all over the city, without testing it on humans? Not the worst thing in the world but deffinately not something to scoff at either, do your writing better!
I really like the controls and was surprised at how fluid they were, and how you had to be facing a direction to move faster, otherwise you walk. Makes for nice "Back up to wall and shoot everything epicly" scenes. Using the E and Q buttons you can change the direction of the camera, and while the camera is very high up and sometimes very restricting, it was well done and made me feel like any time I tapped E or Q by accident that it was a whole new experience, which it wasent but feels that way.
The monsters got annoying a big part of the issue for the game for me. Half the guns are useless, as the only ones I used were the M4 and the Launcher, an entire clip kills two basic guys... normal difficulty. It was crazy because if 6 guys came up to you, then you spent 5 minutes trying to run back and shoot then run and shoot. Not much strategy.
Also you knew every trap, almost every secret is hidden by a onslaught of enemies waiting for you to pass the invisible line. It was annoying because it was expected everytime.
Id say 7/10 for the type of game its meant to be, and the price of 4 dollars. Any cheaper and id rate it .5 higher for every buck less.