Sure, here's an example of a simple game implemented as a single HTML file using JavaScript and enclosed in script tags. The game can be played on a smartphone and uses pictograms:
This game uses a simple game loop to continuously update and render the player object on the canvas. The player is represented by a filled rectangle. It also includes event listeners for touch gestures on the smartphone screen, allowing the player to control the movement of the rectangle by swiping in different directions.