Sure, here's an example of a simple game called "Dumb Mario Shooter" implemented as a single HTML file:
Please note that the implementation assumes you have "emozi_all/player.png" and "emozi_all/enemy.png" images in the same directory as the HTML file. You can replace them with any appropriate images or pictograms of your choice.
This game allows you to control the player character (Mario) horizontally using the arrow keys and shoot bullets upward using the spacebar. The goal is to shoot any enemies that might appear on the screen with the bullets.
Hope you enjoy playing "Dumb Mario Shooter"!