I couldn't figure out how to start a game, so for now this is based on playing as part of GDKO and the tutorial and I'll give more feedback later.
Your tutorial worked pretty well, but I think if I hadn't already played it as part of GDKO I could have been a little lost. I think having the tutorial show the relevant button to pick up, throw, interact, etc... during the tutorial could help get the idea across.
Generally speaking I think this game has all the right things to be the kind of party game that I'd sink a ton of time into with family and friends. One thing you'll need that I don't think exists yet is computer opponents so that people can play either alone or with one person but still have the chaos of four players.