Sure! Below is an example of a simple game called "Fruit.io" implemented as a single HTML file, including JavaScript code enclosed in script tags. The game can be played on a smartphone and uses pictograms. In this game, the player controls a small fruit and needs to eat smaller AI fruits while avoiding the larger AI fruits. The player gains a level when their score reaches 5 or more, and their fruit grows 2% bigger each time they eat a fruit.
Please note that this is a basic implementation just to provide an idea, and you might need to customize it further to meet your specific requirements.