Sure! Here's an example of a simple drawing game implemented as a single HTML file using JavaScript and enclosed in script tags:
This code creates a canvas element where the user can draw using their finger on a smartphone. It listens to touch events and uses the `getContext` method to get a 2D rendering context for the canvas. The user can start drawing by touching the canvas, and the lines will be rendered as they move their finger. By lifting their finger, the drawing stops.
Keep in mind that this is just a basic example without any advanced features, but you can build upon it to create a more complete drawing game with additional tools and features if desired.