How would this work (or at least work in a choice type game)? A detailed and unique world(s) seems like it would require a pretty bulky introduction or explanation and it might be difficult to have a smooth relationship between choice and narrative text.
Most people handle this by putting extra info in a codex in the stat screen. An artist illustrating some of the world/races would help cut down on the narrative bulk without skipping over content like a codex.
Lost in the pages was a community game (although it wasn’t mostly about world building, I don’t think) was able to tie everything together through different books, so maybe something like that could be done, but instead of book, different areas are explored for a player choosen reason or something?