Isometric Forest Ruins

The design is cool, but I still think you need to go back and add more values. As nice as the design is, the amount of the same yellows/greens/blues makes it a bit boring, visually. 

What I'd suggest is going back and adding some highlights to the vegetation (it's a bit bland), and redoing the texture of the water (it doesn't match the level of detail in the rest, so it kind of pulls me out of the composition). 

Don't get me wrong - it's good, but you could make it better.  

Actually I like that limited color palette, that's a true pixel art in retro style.

It looks really great and I totally would like to see a retro game made by you someday. 

I agree with Rikifive. The limited palette (and colors you chose) gives it something extra. More shades would probably make it more vivid but at the same time it could end up being too busy.

I like it lot. Shapes are nice and composition fun.