Reviving this topic, but I love interactive FMG games and I hope to see more of them. I've tried to learn some basic coding in an attempt to build one myself, but never had the time to dedicate.
It's been tough to find a solid FMG game, and the most prominent example is probably "FMG Life Sim" which has been a work in progress for years. FMG games, to be "good" in my eyes, need to have a perfect combination of a few things:
1) Core gameplay loop. Unfortunately, a lot of the FMG games that are easiest to create are simply clicking on options and watching stats go up. Gameplay isn't really engaging in a text adventure, so what has to drive the player forward is the story or the growth result of the character. I think having competent leveling systems (that are balanced and can't be exploited) is sort of step 1.
2) Artwork. Art in these games is rare. To get artwork done, you either have to commission it or be able to create it yourself.
3) The writing. This is the most important piece, especially when you can't include a lot of artwork. If you're going to have the player stare at a screen and click around to see their results go up, you better include descriptions that make the interactivity worth it.
And overall, that kind of goes into one last argument for text-based RPG games: free form or on-rails? Do you create simple but expansive set of descriptions for the player to encounter in a modular fashion, letting them customize their experience? Or do you make it a single story? More like a visual novel, than an actual game? There isn't really a right answer as both have different focuses.
Either way you slice it, I'd love to see more of these. If there's someone that has more technical and coding aptitude to create the game itself and needs to outsource the actual writing content, hit me up. There's a potential we could collab on a project!