Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript:
In this example, I have created a simple game where particles (represented as blue circles) fall from the top of the canvas towards the bottom. The game loop continuously updates the particles' position and redraws them on the canvas.
To play the game on a smartphone, you can open the HTML file in a web browser on your phone. The particles will fall continuously, creating a simple animation that you can observe or interact with.