Sure, here's an example of a simple game that involves tapping a ball and making it move using JavaScript and HTML.
In this game, there is a ball displayed on a canvas element. By tapping on the canvas, the ball will move in the direction of the tap. If the ball goes out of bounds, the game is over and a "Game Over" alert is shown.
Please note that this is a basic example and can be further enhanced with additional features, such as scoring or obstacles, based on your requirements.