GOTY 2016: the year of the FPS
Honorable mentions:
Superhot: really cool idea mechanics wise, but it's very short and the whole meta story thing is just an excuse for not explaining the gameplay.
Stellaris: potentially a fantastic 4X game, but in most of your games you will probably be bored by the lack of events happening.
No Man's Sky: a very relaxing game and with the major base building patch back on track on being an actual good game. But make no mistake: this game is still not much more than looking a pretty planets.