I didn't quite understand the crafting system, and I wasn't sure if I needed to use different colors on different areas, or how to get them.
That being said, I just spammed space to color the entire world, and it was a very enjoyable experience - very therapeutic. I could see this being a fun relaxation game just to fill a world with color and see the end result. Having all sorts of different worlds would be great.
I love the shader effect as well to color the world. Over all, nice work.