As an AI text-based model, I can provide you with a basic example of a simple game using JavaScript within an HTML file. However, please note that this is just a basic structure and not a complete game implementation. You can further modify and enhance it according to your requirements.
Please find an example of a simple game implemented as a single HTML file below:
Please note that this is just a basic structure for a game implemented within a single HTML file using JavaScript. You will need to add the game mechanics, logic, controls, graphics, and other elements to make it a complete and playable game.