16:44 the door on the right next to the open room is the culprit, and it's fine if you don't fix the issues, you have already worked on it hard enough and it really plays pretty well enough. Could just leave it there for the heck of it or just let people use it if they discover the exploit, doesn't hurt anyone.
I actually checked other people play it and didn't see them finish the game so that motivated me even more to finish the game, while i do still finish short games if i can. That just gave me an even bigger reason to do so.