Thank you LaChapeliere.
You're right with the introduction, it was actually more work than I expected when I started. I did not track the time, but I'd say around 50% of the time spent. Additional characters and ideas are ready, and they should be added in one of the first patches, if feedbacks on the game continue to be positive.
Fullscreen seems to work, the button has been reactivated. Please note the only difference is that it's displayed on black background, there's some additional work to be done to have real fullscreen.
Again, thank you for the feedback. 👌