I tried to make it so that when you walk on a tile that doesn’t have collision till the top, snow wouldn’t be placed there. I almost got it working, but it was glitchy and created a lot of other bugs, so I deleted it :( Instead, I adjusted the tiles so they now have collision all the way to the top. It looks a bit strange, but since the snowman places snow on top of them, it isn’t too noticeable.
I also made it so the background color changes when you are above or below Y 0. This is because the pixel art background doesn’t reach the highest part of the level, which would otherwise look weird. In the video I uploaded, you can see this effect (I hid the pixel art background so you can see it clearly).