Sure! Here's a sample game coded as a single HTML file using JavaScript, styled with pictograms where possible:
You can copy this code into a single HTML file and open it in a web browser on your smartphone to play the game. The game allows you to control a player character using arrow keys or swipe gestures (if supported) to move around the screen.
Please note that this is a simple example to demonstrate the implementation of a game using JavaScript in a single HTML file, and it does not include the full functionality or graphics of the actual Subway Surfers game.