I'm glad to assist you in creating the game. Here is a basic example of a simple game implemented in a single HTML file using JavaScript enclosed in script tags:
This game is a simple one where you can control a player square using the arrow keys on your keyboard. The player will move in the direction of the arrow key pressed. The game is displayed on a canvas element.
Hope this helps you get started with creating your game! Feel free to modify and expand it further to suit your needs.