Err, vierbit, actually, I'm digging overkill's edit just a tad bit more, and I'll explain why:
Except for the rocks, which really are a bit too dark, I like how colours intertwine between objects and background. Although the pallette separating way is a good one, in my personal opinion, you can separate elements in a lot of other ways as well.
Only to clarify, while I personally like to separating elements with different colors,
my point was actually to use different palette entries for each element(foreground, background, sprites ect.).
So for example, if I change the colors on the sprite it doesn´t affect the rock tiles.
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Yeah the tree in my edit is probably a bit to bright, but I stay to the brighter stone tiles(maybe a bit darker).
Dont know, maybe because I am not sitting before a super bright LCD screen, but I can hardly see the stones here.