Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript, enclosed in script tags:
This simple game creates a canvas element and allows the player to control a blue square using touch events on a smartphone. The square moves to the position where the player touches the screen. The game continuously redraws the player's position on the canvas using the `gameLoop()` function, which is called recursively using `requestAnimationFrame()` to create a smooth animation effect.
Please note that this is a very basic example, and you can further expand and enhance the game by adding more features, levels, scoring, and so on.