Sure! Here's a simple shooting game implemented as a single HTML file using JavaScript:
To play the game, simply copy the code into a HTML file, open it in your web browser (preferably on a smartphone), and use the left and right arrow keys to move the player character. Press the space bar to shoot bullets and try to hit the moving target. If the target reaches the bottom of the screen, you lose. If you hit the target, you win!
Please note that this is a basic implementation of a shooting game and can be expanded upon to add more features, levels, and better graphics. The code provided here should serve as a starting point.