Sure! Here's a simple football game implemented as a single HTML file using JavaScript and enclosed in script tags. The game can be played on a smartphone and uses pictograms for visual representation.
When you open this HTML file in a web browser on your smartphone, you will see a simple football game. Use the left and right arrow keys to control the player's movement and try to bounce the ball off the player to prevent it from reaching the bottom. If the ball reaches the bottom, the game will be over, and you will see a "Game Over" message on the screen.
Note: This is a basic implementation and can be further enhanced with additional features, levels, or game mechanics based on your requirements.