Thanks for checking it out! It definitely took me some time to find some resources on snowflake simulation : )
The snow flakes are actually very sensitive to the sliders in certain parameter regimes, and other areas not. You can really see this when you put in numbers for the parameter values, but I figured the user wouldn't like this, so I just made sliders. It's a hard place to explore too, with 3 parameters, so it can sometimes take time to find new configurations. I don't have a public repo for it right now, but I can let you know if I make one. Did you want to play with the code?