januarydandelion: Thanks! I had seen those results and thought they all had graphics, but I saw Warsim right after I posted this, felt so stupid. It appears to be the only other one without graphics though.
It's another completely useless GOG tag that only serves to confuse people.
Although in all fairness "Text-Based" can mean almost anything, as it's not the same thing as text adventures, interactive fiction, or parser games.
Anyway, whatever your own definition may be, most likely you won't be finding much more on GOG.
There are some old graphical adventures with parser interface, but that's it.
If you are looking for old, classic text adventures, I think you have to resort to abandonware, as other stores don't really have those either.
If you are looking for newer titles, then there's more selection available in other stores, although not that much.
If what you are looking for doesn't have to be commercial, and you are willing to go through a lot stuff with varying quality, check what you can find in the Interactive Fiction Database:
https://ifdb.org It's probably lacking many of the older games, but more accurate with newer games.