This is cool, but I was initially rather confused by the interactivity. I expected the animations to play through by themselves like similar algorithm visualizations and it took some trial and error to figure out how exactly to advance the animation. Having to move the mouse around to different points all the time gets a little tiresome. I suppose it's nice to allow the user to advance the animation in whatever order they want but I would have been happy to have it play through automatically in a proscribed ordering.