Sure, I can help you create a simple game using JavaScript within a single HTML file. Here's an example implementation using pictograms for smartphone operation:
In this example, the game shows a random pictogram which the player needs to click on to increase their score. The score, time left, and current pictogram are displayed on the screen. The game ends after 10 seconds, and the final score is shown.
Feel free to customize the pictograms, add more features, or enhance the game as per your requirements.