Sure! Here is an example of a simple game implemented as a single HTML file using JavaScript:
This game is a simple particle game where you control a square player using the left and right arrow keys. The player moves horizontally across the canvas. The canvas is represented by the `gameCanvas` element with dimensions 320 pixels wide and 480 pixels tall.
You can customize the game further by adding particle effects, enemies, power-ups, and more. This example gives you a starting point to build upon.