After great feedbacks I added clarifications for some features.
Some players didn't know you could skip already seen dialogues (with the right button) and also that the Dialogue History was in the menu (even though this was shown in the menu directly) So I added a 'Controls screen' in the beginning.
I also added the possibility to hide the interface to see the artwork better with the middle click button.
I changed very little things in dialogues to help players who believe they are stuck but are not.