I think the game is okay for what it is, and its price point.
However, I do have some suggested improvements:
1) The soldier AI (the guys with guns, and gas masks) could use some work. Right now, all they do is run toward you, while shooting. It'd be nice if they moved laterally relative to you, made use of cover, and so forth. Also, if their bodies would linger for a little bit longer rather than disappearing so quickly, it would be good.
2) Being able to kneel, and lean would be nice.
3) Having a save game feature would also be good.
I hope this helps.