It's like pinball, but instead of real objects that the ball collides with the ball is repelled away from all surfaces. Instead of flippers your mouse is a movable 'circle' that repels the ball. To get points you have to accelerate the ball fast enough to overcome the repulsion and actually hit an object. There are also attracting objects that will subtract points. There is no end to the game, but see how high you get before you give up.

It took me ~3 hours from scratch and involves basic python coding. (If you want to try making it, go ahead)