Hi! I was checking out some of the other categories, but when looking at the any% rules, which involve clearing your save and beating the demon, I was left a little unsure of how this category differs from the main beat the demon category?

Beat the Demon is beat the "Demon" that spawns from the temple. Any% is beat the "Demon Lord" that spawns from the cathedral.

The Any% category was added after the Island update since there was now a new "ending" to the game.