@ozmium.eth
Lore for initial campaign? Yes.
Mechanics that have been battle-tested (literally in TTRPG trials) yes.
Front-end application? Framework is there (Deckgl/Webgl solutions, Go-map style interface) being built to run as a PWA so virtually any browser or mobile device can run it, but worst case scenario I'd move to Unity if the day came to make it a proper standalone app. It'd have to reach a point of being like Illuvium I think though for that pivot.