Amazing game, it try to convey a message that is something really complex.
About the gameplay, I like it a lot. Is simple and intuitive, and for me the difficulty was well balanced. I LOVE the rest mechanic, but I'm afraid is explained a little to late in the game. After taking some damage at the beggining I thought there was some bug because I fell the character too slow, I realised what was really happening only after a while. I love the mechanic because is tied with the story itself, improving the player immersion.
About the story... this is an hard one, because I think that is rather subjective what one feels about it. I found it interesting and sometimes even disturbing. It made me think about the theme that's a good thing.
To be completely fair the ending was a bit disappointing. [SPOILERS AHEAD!] I was ready for some sort of morals or maybe for a unaswered question, those would have been fine. But I found a simplification of the theme of trauma that I didn't like. I imagine it's a common thought by who has had that experience, and in a sense, it's seemingly a legitimate request. But in reality, what should we do about it? You can't force people to feel empathy, nor do I believe you should try. It's a much more complex issue than simply saying, "Others don't understand me, they're indifferent and mean". The sense of isolation and being left behind is something that (I imagine) in the context of trauma a person can feel and suffer greatly from, but it can't all be reduced to that. It can't be the end of the story, right?
In any case, I can't stress enough that this is my personal impression and feeling about the story. I would gladly listen to other opinions about it ^^