Wow, really looking forward to watching the whole video! For now, I just skipped to the end to observe the bug. Looks like I introduced it when doing some final day balancing and refactoring. When the king dies, it's supposed to drop the Chalice, not a regular corpse. Then eating the Chalice triggers victory. But the King didn't drop the Chalice... (If you directly eat the king, that also counts as victory, and that works as expected.)
Fixing this is going to the top of my to-do list! Thankfully it's an easy fix, just need to change the definition of the King so it drops the Chalice when killed.
As far as I'm concerned, you can consider yourself the first official winner of Wyrm's Wrath!