Currently there's no specific rules as to what constitutes Any%. Could we have some clarification on what it should entail?

Yes! We are working hard on making the ruleset for Any% in particular. You can expect the official ruleset for Any% to be finished and posted later today (in a couple of hours)

tbh i think it might be better to not have a proper "Any%" this early into the game's life since it doesn't have an ending/credits roll afaik. it might be better to have a category like all quests instead, since we're judging the ending to be Angela's final quest (isn't the colossus a quest from Enok? i forget)

I personally think having both Any% and All Quests is the best. I know that ATLYSS is still in its early stages, but even for the demo version there have been Any% runs recorded. For this current beta version of ATLYSS, the Any% runs will end after completing the The Colossus quest, which I think marks a good end to the current game in words of Any%

Making it clear, when a new big content update come out, like the step from demo to beta, the Any% category we had will be archived as "Beta Any%" and the new version will be the main Any% category.