Absolute favorite is Outer Wilds. The only thing I don't like about it is that I can't experience it again. A true masterpiece of a game.
After that, probably Noita for sheer insanity. Deeply unfair, but getting a god-run going is that much sweeter. It took me ~100 hours to beat it the first time, now I can consistently win if I try but I'm addicted to doing stupid things to see what happens.