This version features better particle growth thanks to a tip on particle Size Grow parameter animation courtesy of Rune at Unity. I was having a real problem getting the behavior I was looking for out of the Size Grow parameter, and it turns out that if you alter that parameter over time, you can get the exponential growth with damping that’s needed for an explosion.
I also converted the textures to grayscale so that they can be color shifted by the system. It takes a little bit of the richness out, but I think we can get it back later. The payoff in color customizability will definitely be worth it.