This is a strange one for me.
Personally, I think it looks like you've treated each tile/object as an individual piece of pixel art, the amount of hue shifts and the heavy sway to blue keeps each object rather dominating- they don't complement each other, they just demand attention.
and most objects look kinda like they have two separate ramps, as if the grass darkened to a point, and the picture burnt through revealing the necessary shades for a rock, the paths, the bushes etc
Again, I have the feeling this is just my personal taste, and some may feel the complete opposite.
But I prefer a more generic style of colouring for the tiles, preferring intricate details rather than unnecessary hue shifts