I'm going to sort of cheat: go back to an ancient entry I did which can be viewed as platform for strongly muti-path stories (with a half-written example). I'll create a story, properly separate the code into two projects (possibly a full re-write in the process, in which case no cheating!) and maybe add the possibility of mini-puzzle games embedded in the story.

Maybe I'll make a maze out of the story architecture - if that's not too ambitious.