Granted, but Miyamoto forces you to only use Mario, Luigi, Peach and Bowser as main characters and all the suporting characters have to be generic nameless Toads.
Also, the story has to be Bowser kidnapping Peach and nothing else because "it's fine without a story, so do we really need one?"
Bowser is not allowed to have a speaking role, Peach has to be a dumb, helpless ditz, and the only joke you can make with Luigi is that he's a scaredy cat and that he lives in Mario's shadow. Also, Mario can only say "It's a me, Mario!" and the various other "Yah"s and "Whahoo"s from the games.
It also has to take place in the Mushroom Kingdom, the set pieces can only be Grass Land, Desert, Ice Land, Beach World, Forest, Jungle, Mountain, Sky World and Lava World,
(Mh-cha mh-cha mh~) and you can only use enemies that originated in Super Mario Bros. (nes).
You also have to dumb it down to make it "for little kids" so all the jokes have to be cringey and in your face. So basically Minions but with Mario.
(God, I had a bit of a field day with that one, didn't I?)
I wish I had a 1 meter tall Shy Guy plushy.