Is there any other codes that can be inputted for another outcome or item?

I managed to get one so far, with Yumiko. The game heavily implies that you can get another ending with the phone code at the end, so I'm playing it again a second time. Is there a point in replaying it after a second time for more endings?

I'm on the second loop and got a bit confused on when to use the code Misaki gave me in the end. Now i read that i'm supposed to use it after chosing Misaki but i can't chose it after already chosing Misaki and crashing and being forced to chose Yumiko, any help?...

Game Looks Great, Please consider providing the full steam experience by adding Steam Achievements.

My understanding of the rules isn't absolute, but in the third tutorial about castling, if you castle queenside, the eyepatch girl also castles queenside, which is an illegal move due to the white rook having influence over the d8 square. An easy fix would be to just have her castle kingside, or maybe have her still castle queenside, but end up getting scolded for making the illegal move Edit:no idea why I said h5 instead of d8 at first....