Sure, here's an example of a simple game implemented as a single HTML file, using JavaScript and enclosed in script tags. The game is designed for smartphone operation and uses pictograms to enhance the visual experience. Copy and paste the code below into an HTML file and open it in a browser to play the game:
This is a basic game where you control a player represented by a red square using the arrow keys on your smartphone. The player can move up, down, left, and right within the bounds of the canvas. The game loop continuously redraws the canvas, updating the player's position based on the user's input. Enjoy playing!