Sure, here's a simple example of an idle game implemented as a single HTML file using JavaScript. This game will increment a score every second automatically, and you can also click on the screen to manually increase the score. Pictograms are not included in this example, but you can customize it with your own images if desired.
Idle Game
Score: 0
To play the game, simply open the HTML file in a web browser (preferably on a smartphone for a better experience). The score will automatically increase every second, and you can also tap or click on the screen to increment the score manually. The current score will be displayed on the screen.