I haven’t played a lot of them, but my favorite is Bridge Commander. I think it was super janky, but also very immersive, had actual voice lines by Brent Spiner and Patrick Stewart, and decent plot.

This. There’s just so much game in that game.

Citizen Sleeper, Chants of Sennaar, Papers Please, The Curse of the Golden Idol.

Because he testified against the entire city’s worth of mafia?

Awesome! Will definitely check it out. In case you haven’t seen it, here’s a nice collection of tips for indie game devs: https://develop.games

(I realize this reads as a bot comment, lol, but that’s a genuine tip, and that website isn’t even monetised as far as I know).

DCSS[1] would alone probably take five years to master.

Dwarf Fortress (although I haven’t really played it myself yet).

And, of course, Factorio, that with existing mods has probably enough content for the rest of my life.

[1] https://crawl.develz.org/

Slice and Dice: https://play.google.com/store/apps/details?id=com.com.tann.dice

I’m surprised no one mentioned it. Hellblade (full title: Hellblade: Senua’s Sacrifice) had me in literal tears. Not only it’s a decent game, it’s also an essay on heavy topics like mental health and the story of viking invasions.