It’s not designed as a text based game, but you could probably play Delta Green that way. I’ve had entire operations go by without a single combat, and you can easily just play them “theater of the mind” style.

The game itself is best described as a crossover between X-files and True Detective, where you’re typically investigating some sort of paranormal activity. It’s modern day, so if you tell someone you’re exploring an apartment or an office, you won’t need a wall of text to describe the setting, and they usually provide some pictures you can share whenever your group encounters a monster.

If you’re looking for a solo ttrpg, check out IronSworn for a semi-nordic low fantasy game that plays great solo. They recently released a sci-fi version called Star forged that’s worth a look if you prefer that genre.