Sure, I can help you with that! Here's an example of a simple game implemented as a single HTML file using JavaScript:
This game displays a pictogram, represented by an emoji, in a container. When the user clicks the "Play" button, the game starts and the pictogram continuously updates every second with a random pictogram from a given list. The game lasts for 5 seconds, after which it stops and displays a "Game Over" message with a finishing symbol.