Really beautiful game. Well written in a way that games aren't normally well written - normal when people say that a game has good writing it's another way of saying 'the dialogue is snappy' or some such. This feels much bigger than that, and solves many of the issues of "story games" for me. The game itself is sort of a point-and-click adventure game but stripped down largely to character interactions and given direct control of the cast. The 'gaminess' of the game is all in service of the story and, as such, makes it perfectly suited for this format.
I have quite literally just finished this and have so many thoughts about it that I can't really coherently put them together but all I can say is that it's magical, daring storytelling that you're unlikely to see anywhere else.

(Initially reviewed this with 4 1/2 stars but amended to 5 after stewing on it for a bit).