Sure! Here's a simple example of a game implemented as a single HTML file, enclosed in script tags and using JavaScript. It's inspired by the popular rhythm game "Friday Night Funkin'":
Please note that this is a basic template to give you an idea of how to structure a game using JavaScript and HTML. You'll need to add additional gameplay mechanics, graphics, audio, and logic specific to your game design. Also, make sure to replace the player.png and enemy.png paths with your actual image paths.