There’s a tutorial that leads towards the first dungeon boss of the game, but after that it looks like you make your own challenges. There’s a few bosses around my level that I’ll be taking on next, then I’m probably going to explore to see if I can find more dungeons.
The creator’s clear check doesn’t count towards the level being cleared, so these levels are uncleared. I think if the creator plays it on the uploader account it wouldn’t count either.