Rules say when you lose control of your character at the end, so I figured that meant as soon as you went to the end cut scene. Feel free to retime if necessary.

This run wasn't that great, and I think it can be pushed to 15:30. It was a first run, so not a ton of practice involved. I may run this once more, but I'm not feeling this game as a speedrunning game too much, so maybe not.