That would be perfect, if you weren't part of the ink line that makes up the circumference of the circle. The ink line is the entirety of the universe, and you can only move in the single dimension that exists in that line. You are welcome to go clockwise or counterclockwise but you will eventually come back to the point where you started. If the Universe (circle) is expanding then the radius is increased and what is now inside the ink line is now in the past. ... ever heard of the term 'light cone'?