Sure! Here's a simplified example of a ball bouncing game written in a single HTML file using JavaScript:
In this game, a ball is represented by a circle that bounces off the walls of the game canvas. The initial position, size, and speed of the ball can be modified by changing the corresponding variables. The game continuously updates the ball's position using the `updateGame()` function and redraws the canvas using the `drawBall()` function. The `requestAnimationFrame()` method is used for the game loop to provide a smooth animation. You can copy and paste this code into a single HTML file and open it in a web browser to play the game.