Create a prototype to start playtesting! It will be rough, rocky, drafty and incomplete. We know!
It could be
* A very short story with one or two choices in twine/Inform 7
* A paper prototype (STRONGLY RECOMMENDED)
https://www.gdcvault.com/play/1020509/Paper-Tales-A-Guide-to (Links to an external site.)
* or something else? Role playing?
https://melonfarm.itch.io/cave-story?secret=QXSaJgpNpUfTNpb03CGLloeOdc
https://mechanicsofmagic.com/2022/02/13/interactive-fiction-tiny-playable-prototype/
https://rachelnaidich.com/game.html
https://sarakolb.itch.io/iteration-1