Click on the color you want to draw with. You can also change the width of the pen. Once you click a color, it makes a drawing so you can also click below it to make the drawing more lower or hold it so it does not make a big mark where the circle is. Also if you want to delete your whole drawing, then you can press space but it will delete the whole drawing and there will be nothing left.
More colors coming soon! I just took a ball sprite with different colors for the colors, so I might add some more that I will color.
