Helloo, sorry to bother ;')
To me, this link also appears expired: [invite invalid], I was wondering if it's supposed to be that way — and if there's a way to currently join the server. I saw the Tumblr post about it and thought it'd be nice to join is as it sounds quite fun with how it was described.
Thank you for your time and I hope you have a lovely day/evening!
P.S: Absolutely in love Mushroom Oasis and Mychael. Can't wait to see how the story further develops in the upcoming days (of the game).