Sure! Here's an example of a simple game where the objective is to keep the pixels inside a box using smartphone operations. The game uses pictograms and is implemented as a single HTML file with JavaScript enclosed in script tags:
In this game, you'll see a box as the game area and a single black pixel inside it. The objective is to keep the pixel within the box by touching and dragging it using smartphone touch events. If the pixel goes outside the box, it turns red. Otherwise, it stays black.
Simply save the above code into an HTML file and open it in a smartphone browser to play the game.