I finally figured out how Ziggurat makes its isolated bubble colonies
one of the workers finds a straight red line (glider's work, most likely) and erases it until coming either to the end of it, or a segment that causes it to start orbiting again (eg. a corner where some of the cells are black)
Given enough games we should be seeing the same results. I exclude the disqualified players (Steamroller Ants and HalfThere) but other than that I just open the page and press run