This is an automatically generated battle between blue and orange balls that bounce around randomly. By touching each other, they can deplete each others health (size) and by staying out of conflict they can regain health automatically. A ball will pop when it is too small. This is kind of a screensaver thing because it goes on forever and you just watch it without doing anything. Try tweaking the code to give one side an unfair advantage.
Inspired by this one screensaver called "Node Battle"