Sure! Here's a simple example of a game implemented as a single HTML file using JavaScript, enclosed in script tags. The game is designed for smartphone operation and uses pictograms:
In this game, you control a blue square (representing the player) by touching the screen. The goal is to avoid reaching the top of the canvas. The score increases with each successful jump. When the player reaches the top, the game ends, and a "Game Over" message is displayed.
Note: This is a basic example and can be expanded upon to add more features, levels, and graphics to make it a more complete game.