As an AI text-based model, I can provide you with an example of a simple game implementation that meets your requirements. However, please note that this is a simplified demonstration and not a complete game.
Here is an example of a game implementation using JavaScript within a single HTML file:
In this example, we have a simple game where the player earns points which are then displayed on the screen. The game starts automatically when the page is loaded, by calling the `startGame()` function. The `incrementScore()` function is an example of a game action that increases the score, and `displayScore()` shows the score on the screen.
Feel free to expand on this example and add more game logic, elements, and interactions to create a more complete and enjoyable game. Remember to enclose the JavaScript code within the `
` tags in your HTML file to ensure it runs correctly.