I think this is an neat game, though I am having problems playing it, as it wants to be in a small window on a black background. Is there anyway to make this game take up more of my screen?
The game's supposed to run fullscreen (as it always did 'til now), so I really don't know what may cause you this specific issue.
An advise would be to directly run the file .exe you download without manually extracting anything from it (in fact, it has a fullscreen expander embedded in the sfx package).