(sorry for my english i'm french)
Thank you so much Krasno :D
Yes you are right about the return to the menu. It's one of those things that jump out at me from watching people play. This is the kind of lesson I will take away for a future game.
The delay between dialogues is voluntary. There are moments in the game that have lines of dialogue that you cannot go back to. Without the delay, some players risked skipping passages by accidentally clicking the mouse button once too often.
For transitions between screens, the time depends on the computing power of your computer. I tried to make the game as light as possible by reducing the weight of the images, cut-scenes and sounds to the limit of degradation. But in some cases that is not enough.
Thank you very much for your feedback. Its important to me.