Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript. Note that this is a very basic game just to give you an idea of how it can be done. Feel free to modify and enhance it to fit your requirements:
In this example, the game involves clicking on a hidden noodle image that randomly appears on the screen. Each successful click increases the score. The game starts as soon as the web page loads on a smartphone. The noodle image is represented by the "emozi_all/game.png" file, which you can replace with your desired pictogram.