It's just snow, I found this awful thing I made 5 or 6 years ago and felt like redoing it because it's easy and barely took any time at all Here's the original: https://scratch.mit.edu/projects/192056952/
I made this in April 2023 and it's now May 2026. I looked back at the original and saw that the snow would pile up in very odd ways and that I had fixed that in the remake, so I was curious as to my method. Turns out I had the snow particles simply stamp when they land, rather than just sitting there making things lag. When the snow particles reach white, it checks whether it's just hitting another falling particle, so it doesn't randomly stop in the air. The original did not do this, and rather just checked whether the snow was below a certain y position. So the snow could not land above that line, which doesn't make a whole lot of sense. I agree with past me calling it awful. The flakes in that one also just...move sideways weirdly? They run away from each other if they touch. I implemented wind in the remake, so that there's randomness but it's consistent. This version is worlds better (but still an unimpressive project) (I was just curious about it three years later lol)