Oh wait I got it working now Just forgot to refresh the tileset in JCS after recompiling ;p that (what you said) would've been my alternative of course

EDIT: found out that I made a mistake while moving around with colors in the palette, after fixing it the snow sadly looks a lot darker. There are no other side effects.

Edit2: Click the image to compare two screenshots made in Return Run.

I couldn't fix the snow and the water, sadly. Just don't use water- it's impossible in 8bit ;p