I am not sure what exactly the rules are.
I understand that the paddle rotates around the ball and you pause it at the right time to hit the ball. If the ball leaves the arena, you lose (the screen goes red).
But why does the screen sometimes go yellow when I hit the ball? What does yellow mean? Have I lost or won? When I hit it thrice, the screen also goes yellow, so I assume I won; but sometimes the screen goes yellow even on the first hit.
The core concept of a round-robin Pong where you freeze an ever-changing paddle looks really fun, but I am unsure what the rules are.