Adding balls to our JezzBall clone

Last time we started a JezzBall clone by allowing you to move a cursor around the screen and draw lines across the playing area. This time, we add balls bouncing around. Will we get far enough for them to collide with the walls? The code is at https://codeberg.org/andybalaam/jezcage. Follow me on mastodon: @andybalaam@mastodon.social