Sure, here is an example of a single HTML file containing JavaScript code that implements a game using pictograms and smartphone-like controls:
This code sets up a canvas where the game is displayed. The emoji is initially set to a smiling face (`😊`) and is placed in the middle of the screen. The arrow keys are used to move the emoji around the canvas. The space bar transforms the emoji into a dragon (`🐉`), and tapping the space bar again returns it to the emoji. The game is continually updated and redrawn whenever a key event occurs.