I never hear about IF. The only author I know of is Emily Short and that was from years ago. Are they big on Steam?
No, the kind of IF you find on steam is CYOA. The real IF can be downloaded here:
http://ifdb.tads.org/
You'll need this to play them:
https://code.google.com/archive/p/garglk/downloads
While some can be played on your browser, others will require to download and use an interpreter to play it. I'd recommend to download and play with the software above, as some IF on browser doesn't save.
As for recommendations:
All Alone and
Lost Pig are short and a good way to learn how to play IF.
The Hitchhiker's Guide to the Galaxy,
The Hobbit,
Zork and
Adventure(the first IF ever) are famous and a must play. Then for horror you got
Theatre and
Anchorhead, both uses Lovecraftian universe as inspiration.
. Amazing that IF people never figured out what book publishers have always known: Fantasy books with good pictures sell better than ones without.
Tbh, I don't think they don't know it. The thing is, Cypher is the only recent IF that you have to pay to play. All the rest is free.