Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript:
Particle Game
This game is a simple particle bouncing around inside a canvas element. The particle is represented by a red square pictogram. It starts moving from the center of the canvas and bounces off the edges.
You can play this game by opening the HTML file on a smartphone or any web browser that supports JavaScript. The particle will continue to bounce around the canvas indefinitely.