Honestly, in my opinion this is what games are about. The unique way of communicating things, important for the author.
I could praise each component of this game: writing, graphics, music, everything. There are so many meaningful details in every corner of it's rich and consistent world.
But the most important thing for me is that every piece represents the authors' intention. The game is talking to the player with it's own language, not translatable to any other medium.
Frankly speaking I don't really like the tone. I'm personally more into something more abstract and not so directly uplifting. More than that I don't quite agree with the message. And the fact, that the game provokes such thoughts and reactions, means that it's really good. That's what games are about, right?