Short experience, but one of the most memorable games of all times.

They tried to create a fascinating and thoughtful story, not that it's poorly done, but it's a hack'n'slah, and the game understands that.
They cleaned it up and left only the best parts, every session of the game is fun.

The innovative mechanics make you always want more.
the way the story is told slowly, mysteriously, makes you confused until the final resolution, but never angry with the confusion.