I've come here just to say what the others above have said. Please bring in an option for multiplayer servers - even a paid version to make it viable on your end if that's necessary. Grounded is such an amazing game, but for those playing co-op, their experience is largely tied to the server they are playing in with their friends. If the host can't open the server, the other players simply don't play and will find a different game to muck around in until the host can launch the server. Let's increase session times, player numbers, and average player lifetimes by introducing multiplayer servers so the co-op player's experience isn't restricted by their co-op world's host.
And while you're at it, just give us one extra player who can join - I'm sick of our fifth player always complaining that he's missed out again
