Sure! Here's an example of a simple game implemented in a single HTML file using JavaScript, enclosed within script tags:
Particle Game
This game is a simple particle simulation where particles move around the canvas randomly. The canvas represents the game area, and particles are represented by blue circles. The particles bounce off the walls of the canvas. The game loop continuously updates the particle positions and redraws them on the canvas.
You can save the code above into a .html file and open it in a web browser, and you should be able to play the game on your smartphone or any device with a browser.