Mmmm, strange you are the first one that is telling me something like that
It's the game full screen? Try alt + Enter maybe if it's not
When I open it, it is in full screen mode, and it remains the same after exiting full screen mode. This is a screenshot of the window mode1 year ago(+1)
I really don't know due to the fact is the first time that a player experience this,
Anyway thanks for having at least tried to play it, I appreciate that!