Sure, here's an example of a simple game implemented as a single HTML file using JavaScript and pictograms:
In this game, you control a blue player using the left and right arrow keys on your smartphone. The objective is to avoid colliding with the red enemy. If you hit the enemy, you lose a life. The game continues until you run out of lives, after which a game over message will appear.
Note: This is a basic example to showcase the implementation of a game using HTML, CSS, and JavaScript. Feel free to enhance and customize it further based on your specific requirements and design preferences.