Steam

Roguelikes tend to be very good for this. They let you play and have complexity from emergent situations, not an overload of controls.

It's old, but if you haven't played "enter the gungeon" pick it up! Hades is fun and well written, there is a lot of text but it doesn't feel like an interruption. Honestly the other games from that studio fit that description.

If you like puzzle games, everything by zachtronics is both great and very difficult. Magnum Opus is probably the best entry point, but space chem is what I started with and it's still my true love.

I expected to hate the souls games, mostly because of how irritating the fans are ("it's so hard!", "Get good!", ect) but they are great games. They aren't nearly as hard as everyone makes them out to be. I'm 40, so I started playing games when dying meant losing all progress, so I see the death penalty of dark souls as normal. What no one talks about is how changing your weapon changes the game drastically, to the point that stats on weapons don't really matter, it's all move sets.

I also love Factorio, dwarf fortress and EUIV, but I think that's a personal failing I have to work on.