I like the colors of the grass, but i'm going to repeat some advice someone gave me a while ago. You want the player to focus on the things that actually matter for gameplay (in this case the top of the platform where the player can walk). Right now the rocky bottom part pops out way more than the top because of brightness and saturation. Maybe you should try increasing the contrast on the grass by making its darkest shade(s) darker so the highlight at the top pops out more.
Perhaps the contrast already works much better on a dark background by the way, since its shown on a white background here

Also I noticed all your brown tones are fully saturated, it usually looks better when you slide through the saturation as well as the hue in your color ramps

edit:
played with the colors a bit, i think the purple-ish shadows look nice but the lighter tones dont really look that nice in my version. Also noticed it was indeed mostly the light background that messes up the contrast.