Hi there!

It is a big problem, especially on mobile devices, that reloading the page, or "going back" in the browser destroys the game for all players. Maybe it is possible to implement this "Are you sure to leave this page" allert via JS as a first step. (Would be this okay with PWA requirements? Idk). Maybe later it would be nice, if it is possible to reenter to the room and leaving without destroying the game.