As I discussed in my first book (and maybe my second?) I think that the best way to develop a story, any story, is to tell it over and over, to different people, without notes. This gets you a bunch of things:
a. You can tell how it holds together. If you can't remember what comes next, then the story logic needs mending
b. You can immediately tell if your listener is bored. People who read your writing have time to prepare a lie, but if their eyes glaze over, they're bored
c. You may come up with something better as you tell your story on the fly. Writing a story down freezes it, but until then, it's a fluid, living, growing thing.
So here's Yannick Trapman-O'Brian, immersive experience-maker, on Reality Escape Pod S8E7:
"I wish upon everyone an intoxicated audience. The clarity it requires of you, someone just looking you full in the face as you do your beautiful dance piece and they go, 'Okay, this is boring, I'd rather go pee.' That is such good feedback."
See?