Idk if it still works, but if you press the "1" key on your keyboard repeatedly, it automatically gives you mementos and by that you can finish the game in one minute. (Just wait until the "X/12 Mementos Collected" caption disappears, else it stops at 11 mementos)
I don't usually comment, but DAMN, you're absolutely AMAZING with these Slender attempts/maps, I've literally been binge-watching these videos all morning - and I'd love it if you did the other ones ^ . ^
I've been experimenting around in mansion and guess what? Slendy spawns at 0 mementos if you collect a key. And how the hell does he fit a grandfather clock in his underwear?