Just finished it. I found the ending kind of fitting. He saved one family when in all likely hood, he wouldn't be able to save his own. A personal salvation kind of thing. I'm a huge fan of bad endings (Main character dies, the goal ends up failing by design, and just shit going south in the end.), so it worked for me.
Also, that mutant thing is totally accessabile be doing a little climbing around. If you decide to help him, which takes a lot of resources, he gives you something awesome.
So far, I'm really liking the desperation that the games atmosphere throws at you and the stamina system when climbing buildings and objects of debris. The combat is a little hit-and-miss, but once you realize that you have to strategize before you act, it'll start clicking together. Also, the lack resources and limited retries makes it that much more intense. Could be good or bad, take your pick.