I also got the high score bug . I think it has something to do with subsequent plays . I played like 5 times, and every time I restarded, things were a little crazier, with the score/ speed bar flickering between 0 and one of my previous scores
http://img8.imageshack.us/img8/5540/kanalpemba.png
after a few more plays, in the middle of the game I see a title screen flickering and some of my clicks don’t register. I’m almost sure that there are 2 (or more) instances of the game running on top of each other, and some of my clicks are registered in one instance and one in another .
I think you can reproduce it playing 7-8 times in a row .
@ java 1.6_021 - Firefox