Sure, here's a simple game implemented in a single HTML file using JavaScript, enclosed in script tags:
This game provides a simple canvas where the player can move around using the arrow keys on a smartphone. The player is represented by a blue square pictogram. The game loop runs at 60 frames per second, continuously updating the player's position and redrawing the canvas.
Note that this game is just a basic implementation to demonstrate the concept. You can modify and enhance it as per your requirements and add additional features, levels, graphics, and gameplay elements.