Stacked year!
Resident Evil 7 is a candidate for the best in the franchise, and certainly the most scary. It has some rough edges in the third act, but is a masterpiece otherwise.
Breath of the Wild was an f****** event in gaming history! It was a mind-blowing experience, and a step forward for open-world games, even if it built on what MGSV, Skyrim and some of Ubisoft's games had done before.
What Remains of Edith Finch was probably the game that pushed the medium forward the most that year with how it handled storytelling.
Hollow Knight was a perfectly crafted souls-like metroidvania, with fantastic world-design and combat.
Any of these would deserve GOTY, and then you have Sonic Mania and Cuphead, which are great as well. And I haven't even tried Nier: Automata or Horizon: Zero Dawn.
Decided to vote for Hollow Knight.