An on-going interactive fiction project started in 2016 and worked on only at the year's end. It uses a custom story engine called Flux. Its current incarnation involves saving your family from a Christmas without presents while trapped in a blizzard.
Needed this feature for a long time. Finally implemented local storage in #Flux. Changes are now saved immediately in browser. Firebase storage is now controlled manually with Cloud Save/Load buttons in the main editor component.