As an AI text-based model, I'm not able to create or edit video content directly. However, I can help you with the JavaScript code to create a simple game within a single HTML file. Keep in mind that complex games might require additional files and resources (such as images or sounds), which may not be feasible within a single HTML file. Here's an example of a basic game implementation using JavaScript encapsulated in script tags:
Please note that this is just a basic template, and you would need to add your specific game logic, graphics, and user interaction code to make a complete and functional game.