Thank you for all the suggestions! :)

Buddy Simulator 1984 looks great, and the most interesting, because it (seems to?) combine text chat with other gameplay.

I honestly did a bad job with the title of my post (entirely my fault!) because most people have been going straight to the text adventure genre for recommendations, and that wasn’t quite what I had hoped for.

Text adventure games are easy to find. So are games that simply involve a lot of typing of any kind. There’s a typing tag on steam, after all!

What’s not easy to find are games which aren’t necessarily entirely text-based or text parsing, but have natural language chat as part of their gameplay.

So they could be any genre - walking sim, puzzle, horror, anything, even an FPS or an RTS! Though I struggle to imagine how a game could fit natural language chat as part of a single player FPS, but if they did it, I’d be interested!

In all, what im interested in is a pretty specific and weird non-genre that doesn’t fit established categorisation, and that’s why I needed Fellow Humans to help, because tags on steam simply cannot.

So, thank you for the Buddy Simulator recommendation. I’ll certainly be playing that one! :)