Kentucky Route Zero is one of the best atmospheric and throught-provoking gaes out there.
It's good and the artstyle is great and creative but I don't know if I would say it is one of the best ... or thought provoking. It's surreal and the player does not really know what it's all about but that's part of its charme. STill I doubt that there's a great hidden message behind it in the end ... might be wrong - but I doubt it. It simply is a great experience if you don't have trouble with reading a lot of text :)
They worked really slowly, but they never bandoned the project - if you REALLy followed the project, you would know. It is a two-people game too, you know. We'll see if the conclusion is satisfying.
Even with 2 people the developing time is ridiculous. Many refunded the game and I can relate because you could hardly call this time reasonable. Working slow and doing good work is one thing - letting those who paid wait for 7 years is another. Like I already said: I give it to them that they finished what they started and that they never abandoned the game but I probably would not buy another game from these two guys.