My game works fine on my PC and my notebook. It has an INI where you can set your stuff. By default, it's like this:
[Rendering]
Windowed=1
Width=1022
Height=900
[Audio]
Sound=1
Music=1
If Windowed is 1, the game creates a WidthxHeight window.
If Windowed is 0, the game creates a fullscreen WidthxHeight window.
If my friend starts the game with Windowed 1, the window doesn't appear, but the music starts.
If my friend starts the game with Windowed 0, the tiles are way too small for his resolution.
Why isn't a window created with Windowed 1?