Took a peek at this over the weekend, and was sufficiently intrigued by the trial to purchase the whole thing. What can I say except that it was a great game. I thoroughly enjoyed my weekend exploring this blasted out world; which I must say was very reminiscent of Cormac McCarthy's The Road.
Gameplay consisted of some simple platform mechanics, and survival-like combat. I especially found the strategy involved in surviving combat particularly rewarding. Every bullet and arrow is a precious resource, and you are constantly trying to minimize their expenditure. Playing in survival mode, where "retries from checkpoints" are limited, you have the additional pressure of simply surviving when your strategy goes out the window. Having said that, if you scour every area as much as possible, you should never be short on health items.
Now, I had no idea about it's troubled history when I played through it, but by game's end I am hoping for a follow up, a chance to continue Adam's story.