This is my evolution simulator! I uploaded some videos of this simulator to my YouTube channel carykh: https://www.youtube.com/watch?v=GOFws_hhZs8
It runs about 3x faster in the Java version.
Also: the JS version might have trouble drawing rectangles. If that happens, disable hardware acceleration in your browser.
For the java version: you need to create the font that it uses. Just go to Tools... create font... Helvetica-Bold, and set the font size to 96. The file name should already be "Helvetica-Bold-96.vlw".