Sure, here's an example of a simple shooting game implemented as a single HTML file using JavaScript and pictograms:
You can save the above code as an HTML file and open it in a web browser. It will display a simple shooting game where you control a player with arrow keys and shoot bullets with the spacebar. The goal is to shoot the enemies (green squares) without getting hit by them. Your score will increase by 1 for each enemy shot. The game ends if an enemy collides with the player.