Sure, here's an example of a simple shooting game using a single HTML file, JavaScript, and pictograms. In this game, Rocky Balboa is riding a T-Rex and shooting targets. Please note that this is just a basic implementation to give you an idea, and you can further enhance and customize it as per your requirements.
Rocky's Shooting Game
Please copy the code above and save it with a `.html` extension. You can then open the HTML file in your web browser to play the game. Use the left and right arrow keys to move Rocky and the spacebar to shoot the bullet. The goal is to prevent the target from reaching the bottom of the screen. If the target collides with Rocky, it's game over.