Coloring Paints For Kids Demo Game

I used Godot Engine to made. Everything is done in 2 days. There are 2 shaders , one of them for turning paints to white and black because actual paints parts are already painted with different colors to detect which part should be painted by shaders. Other shader is for masking brushes by using these prepainted colors. When you click the screen it detect which color is under the mouse then passes to shader. I know it seems white but actual paints arent. In app you can undo, delete all history, ...