Sure! Here's a simple game where you control a character and jump over monsters while shooting them. The game will be represented using pictograms and will be implemented as a single HTML file enclosed in script tags:
To play the game, save the above code into an HTML file (e.g., `game.html`) and open it in a web browser (preferably on a smartphone). The character can be controlled using the "Arrow Up" key (to jump) and the "Space" key (to shoot bullets). You need to jump over or shoot the monsters to avoid colliding with them. If the character collides with a monster, an alert will be shown indicating that the game is over.