Sure, here's an example of a game implemented as a single HTML file with JavaScript, using pictograms and focused on smartphone operation. The game is called "Defense of the Base":
Defense of the Base
Score: 0
In this game, you control the base (represented by a pictogram) using touch or mouse input. The goal is to defend the base from the moving trucks and humans (also represented by pictograms). If any enemy touches the base, the game is over, and your score is displayed.
Please note that you would need to provide the pictogram images (base.png, truck.png, human.png) and adjust their file paths accordingly.