Sure! Here's a simple implementation of a game where you, as the moon, need to protect the earth from asteroids. The game can be played on a smartphone using pictograms.
To play the game, simply open the HTML file on your smartphone's browser. You can control the moon's movement by touching and dragging on the canvas. The goal is to prevent asteroids from reaching the Earth (depicted as 🌍) by intercepting them with the moon (🌕). If an asteroid (💥) collides with the Earth, the game will end with a "Game Over" alert.
Note: The code provided is a basic example and can be enhanced with additional features, levels, scoring, and more graphical elements if desired.