Cool! GA - that was the idea of original author of Soda as well. Did you capture some videos of these evolutions? Was it hard to control? It's extremely interesting to me :)
Some people may remember this old java applt, I rewritten it in JS recently, its free possible to use in classroom, enjoy:
http://panoramx.ift.uni.wroc.pl/%7Emaq/felp.pl/sanjose/index.html
The article about it is here.
Enjoy my collection of physics&related html mini applications, it's free and not commercial (I did them for fun and for my kids at extra school lesson). The idea was "so you have this adress and discover by yourself what is that".
Some are simply just external links to PHeT etc, some are unique...