Stuff I picked up:
Snakebird - Good deep puzzle game where you snake around a level and try not to let gravity kill you. It can be difficult if you don't analyze the level, there's no real tutorial to figure out techniques it's all self found. Something that most modern games severely lack.
Hacknet - Hacking "sim" and pretty neat if that kinda of thing interests you. There's some small goofy visualizations of cracking but nothing like the movie/tv shit of flying through tubes more like tables of random ascii fluttering about.
Suggestions:
The Witness - Myst-like puzzle game that doesn't rely on obtuse ridiculous shit. Giant island with puzzles to solve and things to find, really beautiful and calm setting overall. Super good chill pallet cleansing game. Yeah it's $31.99 but I got 30 hours out of it when I first beat it and still have about 30% of things to do to complete it.
Magnetic By Nature - Kinda buggy physics platforming game but unique to my knowledge. My friend help make it so i'm a little biased, but fuck it. It's only $1.50 and you can easily get that much fun out of it, just refund it in 2 hours if it ain't your jam.