As I've seen more responses here, I started getting curious about how screen size impacts results with that game, so I ran a few test runs on my desktop. I'm finding that my score varies by around 30-40% depending on the size of the viewing window, with smaller windows being better. So the results I posted, for 15" screens, figure to be lower than what folks would score with a 13" screen (or if using 15" with small viewing window).

Not to say that others won't be better at the game than my control runs, but I think that's going to contribute to some pretty high variance among ad hoc results reported here.