i came in here to namedrop english country tune but felix had me covered. increpare’s got a ton of short freeware games too, some of which are puzzlers (mirror stage, opera omnia, kettle, many others). dude literally made PuzzleScript
speaking of puzzlescript, play heroes of sokoban and its many sequels (all freeware)
and speaking of sokoban, play A Good Snowman is Hard to Build (very underrated, very friendly difficulty curve, one of the only hangoutable puzzle games i’ve seen)
starseed pilgrim is perfect if you want a game about figuring out what to do on your own rather than strictly designed puzzles
world of goo is sort of a puzzle game, enough for me to remind everyone it exists and is beautiful and wonderful and good
joke answers: la mulana (How Much Do You Hate Yourself? Take This Quiz to Find Out), braid