Sure! Here's an example of a simple football game implemented as a single HTML file using JavaScript. The game will run in a web browser, including on smartphones:
To run this code, save it as an HTML file and open it in a web browser. The game will display a canvas with a football image bouncing around inside. The football's movement will be automatically updated in the game loop function.
Note that in the code, you need to replace the `emozi_himawari.png` with the actual URL of the football image you want to use. Additionally, you can modify the size of the canvas and the football by changing the `width`, `height`, and `30` values accordingly.
Feel free to expand on this example by adding more game elements, controls, and gameplay mechanics to create a fully-fledged football game experience!