Sure! Here's an example of a simple game that allows you to draw on the screen using JavaScript and HTML:
To play the game, open the HTML file on a smartphone. When you touch or click and drag on the canvas, it will start drawing a line. You can draw anything you like on the screen using your finger or a stylus.
Please note that this is a basic example and does not include advanced features like color selection or erasing. You can enhance the game by adding additional functionalities as per your requirements.