>>718298735
It depends on whatever this door is supposed to represent.
Red horns represent Kris, and you sacrifice the white cloak to enter in the first place.
Maybe (you) enter Kris' inner self and then erase him.
The fact that the bunker key is there, might also be a hint that you're in Kris' mind, because it represents suppressed memories.

>>716426657
>independant of routing
There's a reason you get the option to pick "I'll never play again"