This was really nice. The deductions and ahas are nice like in Obra Dinn, but it's also overall a different experience that can stand on its own.
Taiji
A fun witness-like.
The Sekimeiya: Spun Glass
please play this holy fuck
Outer Wilds
This was certainly an experience. I love games with "organic" puzzles.
Baba is You
I didn't think the mechanic was impressive, but fortunately it was in the right hands. The puzzles are very well done, and the "latter phase" of the game is beautiful.
Return of the Obra Dinn
A breath of fresh air.
Stephen's Sausage Roll
The Witness
Lots of good fun and interesting ideas.
Snakebird
The only good mobile puzzle game. It is high on this list for being able to achieve good-puzzle-game status on such a platform. Kudos.
The Talos Principle
Antichamber
Portal 2
The Misadventures of P.B. Winterbottom
Machinarium
Braid
Time shenanigan are always nice. Though I'm not sure how well the puzzles hold up today in my eyes.