Just seen there was an official topic for bug report. Glitch on the last choice : any pick I make triggers the same ending. I attached the concerned save file from where I got the problem.
https://itch.io/t/1045925/bug-
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Edit : in fact I have the same symptom on another dialogs. Or it's a bug or... All route haven't all choices available ? I don't know. I'll try more things. I want this happy end godammit :p
Edit2 : ok had my good ending. Ahm. Not a super fan of the choice picking/result, it wasn't obvious at all. Still the story was good ! I totaly forgive you :o