Capsule II is an IFComp 2015 game that was well-received by many people. It involves a group of people called the Sandmen who are custodians over a giant ship. Each one spends years alone, and the game deals with their isolation.
The game has some great animations and illustrations in a sort of vintage washed-out/watercolor look (look at the cover art). I think it is just fantastic as in-game art.
The game has some profanity, references to porn, etc., which is a turn-off for me. But all of it fits with the character's personality. Many people have expressed the opinion that they expected the game to not be that great but that it somehow has that essential 'it'-ness that makes a game good. I see people talking about this game for a long time to come.