I can't get the page to work either on mobile or Desktop, even disabling ublock. I thought it was happening only to me.

Looks to me like it's trying to generate some sort of Buddhabrot, or possibly the anti-Buddhabrot from this page:

https://en.wikipedia.org/wiki/Buddhabrot

Actually now that I look at it I think it's the combination of the two. Basically, take a grid of points and iterate them through the Mandelbrot function, plotting where they land at each iteration.

(The Buddhabrot discards all trajectories that don't escape. I don't think this one does.)