As described though, it is slow-paced game, we'll need about 15-20 players to start, so you can join and return back to check on what's happening the next day.
I have 3 data-protection lawyers on my game-jam team. They were working hard to ensure in-game data-collection adhears to all international and local data-protection regulations.
Logging in is handled with Google Firebase, so it should be secure.