That was the first question I was asking myself. I would literally LOVE having this experience in a multiplayer experience (imagine players starting in other planets, creating their own tribes, developping and exploring in different ways accross the universe. That would be amazing!). But I should be honest: I don’t have a lot of experience in backend, authoritative server, authentification, BDD and such… I scratched a bit but seeing what I want to achieve I will be stuck quite a while without advancing the frontend if I do that. And I don’t have the money either!
Even if it pains me I will focus on a SOLO game. Maybe I will add some multiplayer experiences later but only for a few features, not for the whole game (like Dark Souls for example). And of course it will not be done before… a few years =)