Sure! Here's an example of a simple football game implemented in a single HTML file using JavaScript. It assumes smartphone operation and uses pictograms for visualization:
Football Game
In this game, you control the player (represented by a pictogram) using the left and right arrow keys to move horizontally on the field. Pressing the spacebar will "kick" the ball (represented by a black circle) towards the right. The ball will move to the right with an animation and reset after 1 second.
Please note that for the game to work properly, you need to have an image file named "emozi_all/game.png" in the same directory as the HTML file. You can replace this image file with any pictogram of your choice.
Remember to save the HTML file with a .html extension and open it in a web browser to play the game.