That looks fun Todd, thanks for sharing
I assume that you must be using custom materials, there’s nothing like that in the starter content from what I can see!
It’s modified (hacked up) “pulse” tile from the starter content.
Looks great! Would you mind telling us what elements you modified?
Mainly the texture coordinates (just time feeding into it in the original Pulse tile), connections to both time and world-space coordinates, adding them, semi-randomly playing till it looked ok.