Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript. The game allows you to control a character using a joystick-like control on a smartphone. It uses pictograms to represent the character and controls.
To open and play the game, simply copy the code into a new HTML file, save it with a `.html` extension, and open it in a web browser. The game interface will be displayed with a joystick-like control at the bottom left corner. Use your finger on the joystick handle to move the character represented by a pictogram. Release the joystick handle to stop character movement. The game interface will update accordingly to reflect the character's position.
Please note that this is a basic example to demonstrate the concept and might not be optimized for all devices or screen sizes. You can further customize and enhance the game as per your requirements.