As an AI language model, I can provide you with a template for a simple game implemented as a single HTML file, enclosed in script tags and written in JavaScript. Please note that this template serves as a starting point, and you can modify and enhance it according to your requirements.
This template sets up a simple game canvas and draws a circle that moves diagonally within it. It uses the HTML5 canvas and JavaScript's requestAnimationFrame method to create a smooth animation loop. You can add collision detection, user input handling, scoring, and other game elements as per your requirements. Remember to include pictograms or any other visual assets you want to use within the canvas drawing logic.