Very nice, I really like the vector animations :)

One thing I'd say is to apply some anti-aliasing (MSAA, SMAA?)—even on a 4K display with a pixel density of 64.3 px/cm, the jaggies are visible, especially because of the extreme contrast of the caustics behind the dark background.

I'm not especially familiar with this, but I believe making the SVG element larger can increase its filter effects' resolution, and then using CSS transforms to scale the element's parent will return it to its original size, but with a higher resolution result. From there, additional changes to the filter effect (to incorporate a subtle blur for instance) may help it over the finish line.

Regardless, this is a great writeup for changes I wish to never see in ordinary UI.