It's far too early to make any game of the year predictions but I'm happy to put OmniBus' [official site] trailer forward as a likely TOTY contender. Presented as a documentary study of a game that has been in development hell for since the "next-to-last gen". The game itself is a surreal bus simulator, though it looks to be in the manner of Crazy Taxi via Keita Takahashi rather than Goat Simulator + wheels.
Yes, even Hotline Miami Cart Racer raised a smile.
Devolver had a hell of a 2015. I can't think of another publisher that released quite as many games that I loved/liked: The Talos Principle Road to Gehenna, Downwell, Broforce, Titan Souls, Not a Hero, Hotline Miami 2, and Dropsy. There might be more.
Here's the word on Omnibus:
"OmniBus is next-to-last gen physics game about the most powerful bus in the universe that can’t stop or even slow down for reasons incomprehensible to the simple human mind. OmniBus must complete missions at the behest of citizens as its speed increases to unsafe speeds and without landing on its head or sides. OmniBus drivers will choose from the bizarre mission mode, thrilling trick mode and versus multiplayer mode for up to four players to achieve goals, set high scores, and receive total enlightenment."
Ah. Forget my previous reference to Crazy Taxi. This might be Speed by way of Roundabout.