Here's an example implementation of a simple platformer game where you are chased by a demon. It is enclosed in script tags and can be run as a single HTML file:
To play the game:
- Save the above code in a file with a .html extension.
- Open the file in a web browser.
- Use the Arrow Right and Arrow Left keys to move the player character.
- Avoid touching the demon or falling off the platforms.
- If you touch the demon, a game over screen will appear with a "Retry" button. Click the "Retry" button to restart the game.