Sure, here's a simple drawing game implemented in a single HTML file using JavaScript. It allows users to draw on a canvas using a smartphone touch interface and includes pictogram icons for different tools. The game starts automatically when the page loads.
In this game, you can use the icons of a pencil, brush, and eraser to draw on the canvas using your smartphone's touch interface. The drawn lines will appear in black for the pencil, blue for the brush, and will erase with the eraser.