Click the green flag to start the project, the thickness of the circle is in pixels but the size of the circle is how many steps the pencil takes before turning one degree, this means that a small change can cover the entire stage or more. A size of three will fill a normal stage, but a size of 6 will fill a stage that is twice as big as the normal one, try it on TurboWarp. https://turbowarp.org/646973287?size=960x720&hqpen