I think there may be a bug in the post jam version - pressing F doesn't activate full screen (tested on Win10).
You are probably right. Will take a look.
Fixed!
Thanks, works great, however, there are now vertical black lines that seem to be separating textures?
Those are texture artifacts from being increased in size. I have to re-process the textures to fix. When I get a free moment I will do just that. Thanks for the screenshot!