This is a remake of the beautiful https://codepen.io/K-T/pen/eYOPpwd by K-T with ZIM being 21% the amount of code. BUT... ZIM already has Physics and Particle Emitters where K-T amazingly coded it all! Cheers!
Still... we coded the project in a couple hours. We did not add the beautiful gradients but we could have - our ZIM style is more flat.