Actually maxie, CuriousGaming has fixed that issue. A minor bug that does still reside is once you go past about 2000 revisit, the square turns green again (although squeaky doesn't prefer any more than he should so it doesn't affect game play)
That is sweet, Brog. If I were to make any changes to it (which I might as you've so kindly included the source!) is change the movement to WASD and include a quit feature; at the moment I have to ALT+CTRL+DEL it :(
Great app though!