Computer game: Slay the Spire. There is nothing I have played or enjoyed more. It is a great rogue-like deckbuilder at an indie price, with lots of variation and replayability. It has a very high skill ceiling, and you can also dial up the randomness if you prefer that.
Board game: Spirit Island. It is a deep strategy cooperative game with variable powers and strong theming. It places you in the opposite of the usual game role, driving off the settlers. This can also be played in modes that are almost purely predictable or with increasing randomness. It also plays excellently as a solo game. I have played Spirit Island every two days since I learned the game. It is great, although difficult to introduce to large groups.
What are your top games this year?