Sure! Here's an example of a simple game featuring a circle with physics implemented in a single HTML file:
This example creates a canvas element and defines a circle object with properties such as position, radius, color, and velocity. The `drawCircle` function is responsible for drawing the circle on the canvas, while the `updateCirclePosition` function updates its position based on the velocity and ensures it bounces off the edges of the canvas. The game loop continuously clears the canvas, draws the updated circle, and requests the next animation frame to create an animation effect.