Woody Tigerbaum - thanks!
I want to say thanks to the folks who said kind things in the comments, and the folks who rated the game well.I also want to thank Richard for all his hard work on PyWeek - round of applause for Richard.
And another specific thanks to Richard, a couple people mentioned in their comments that the color-blindness assistance was a nice idea. Richard gets the credit for that one - he suggested that the original design might be problematic. I'm not sure if the "high contrast" patterns actually are playable with moving marbles, but I'm glad that people appreciated the feature.
I already know of several errors in the game, including getting names wrong in the readme, grammatical and spelling errors in the intro text, and at least a few logic errors having to do with the pause menu. Also, I crammed a lot of content into the game at the last minute, without attempting to make it bandwidth-friendly, so there's improvements to be made there. Also, there are a few features I wanted to get into the game that might have made it a little less annoying at times.
I've already put up a page for the game on http://www.pygame.org (as should you all for your games, go go go). I'll also be collecting my thoughts and providing downloads of newer versions at http://www.bigdicegames.com/PyWeek5/
Thanks again to all - is it too early to start designing "Woody Tigerbaum 3"? :)