Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript and enclosed in script tags:
Simple Game
In this game, you can control the player using the arrow keys on your smartphone. The goal is to avoid colliding with the enemy character. Whenever a collision occurs, the game will show an alert with a game over message and reset the enemy's position randomly.
Please note that this is a basic example, and you may need to add more features or improve the visuals to make it a complete and engaging game.