Fate/Extella
I didn't play that many games released this year, so by default, this is my GOTY. It's really fun, the story is pretty cool and is a really cool continuation from Extra, the side-stories are funny and offer some breaks from what happens in the main paths, and though the gameplay is pretty simple, it makes it easy to get into, the kind of game you can just pick up and play.
Runner Up:
Ghost Recon Wildlands
It has the same issues that a lot of other Ubisoft open world games have, but it's still pretty fun, specially if you play it in coop and abandon any pretense of stealth. The Predator mission was fucking awesome too.