That story doesn't really work because the mirror image being Momoko is related to the plot as you know, since you beat the game.
The turn idea works lot better, I may actually explore something like that in future version after the contest but I need to change the layout of the mirror maze. Thank you from the suggestion!
Actually, Clocktower didn't provide any clues aside the mural and the breakable wall being different color, if you didn't know what you were doing you'd go in blind and not be able to get S rank, because some objects you didn't even know would be important would get lost in the background like the photo which you can't even see that it's on the desk in the graphic. Also, no one who plays that first time has any idea that pair of hands come and strangle you through a mirror in that game either and there's no clue about that or the killer parrot that can kill you if you don't grab the sheets.