Sure! Here's an example of a simple game implemented as a single HTML file with JavaScript:
This game simulates bouncing particles moving around inside a canvas. Each particle is represented as a colored circle, and they move randomly and bounce off the walls of the canvas. The game runs at 60 frames per second.
To play the game, you can open this HTML file in a web browser on your smartphone. The particles will automatically start moving and bouncing around. You can also modify the code to add additional features or interactions if you'd like.