Sure! Here's a simple game called Antonball implemented as a single HTML file using JavaScript:
This HTML file sets up a canvas element where the game is displayed. It initializes the game, creates an `Antonball` object to represent the main character, and defines the game loop to continuously update and render the game. The `update` method of the `Antonball` object controls its movement and collision behavior, and the `draw` method is responsible for rendering the ball on the canvas.