I will provide you with a basic example of a simple game implemented as a single HTML file with JavaScript code enclosed in script tags. Please note that this is a very basic game for demonstration purposes and may not meet all your requirements or specifications. Here's the code:
Pictogram Game
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Click the pictogram above!
In this game, a random pictogram is displayed, and the player needs to click on it to increase their score. Every time they click, a new random pictogram is displayed, and the score is updated accordingly. The player's score is displayed below the pictogram. The game uses commonly available pictograms like the sun, rainbow, apple, dog, rocket, celebration, and soccer ball.
You can copy this code into a plain text file with a ".html" extension, and open it in a web browser (preferably on a smartphone) to play the game. Simply tap/click on the pictogram to increase your score.