The game does not fit into the screen perfectly
Not quite sure what you mean? I know the Lilou version does not fit properly because it's default size does not match the size of my game and I have yet to find a way to fix that. If you are referring to the itch.io version, I'm confused. Sometimes GDevelop games don't fit properly if you add a fullscreen button without setting the camera and background image just right, but I made sure not to enable one. If the issue is still there, could you post a screenshot?
Odd. I have not been able to recreate that myself outside the Lilou page, which insists on a window size much bigger than my game. On itch, I have found no problems. After the jam, I will see if I can add a version with a larger image for the start screen.
Thanks for bringing this to my attention!
Edit: Are you playing the Windows version? Just checked it on my computer and if the window is maximized, this issue does appear.