Sure! Here's a simple example of generative art implemented as a game in a single HTML file using JavaScript:
This HTML file sets up a canvas element and a JavaScript block to generate and draw random shapes (rectangles and circles) on the canvas. The shapes are filled with random colors, generated using the `getRandomColor()` function. The `drawShapes()` function is called initially and whenever the canvas is clicked.
To play the game, simply open the HTML file in a smartphone browser and tap on the canvas to generate new random shapes.
Note: This is a very basic example of generative art as a game. You can modify and enhance it as per your requirements, adding more game mechanics, rules, and interactions.