Aha you won't believe me; nothing happen when I try to press "x" or "z" (or the arrows keys) after the first dialogue (the one on the first screen) :/ Theses inputs are functional in the Title Screen, or in Option :)
Yeah that happens if you make last second changes without testing them properly... Wanted to change the key you have to press when you are game over from z to enter but accidently changed it for the text boxes :/