Sure, I can help you create a generative art game using JavaScript in a single HTML file. Here's an example for you:
This code will create a simple generative art game where colorful squares will appear randomly within the canvas every second. The color and position of each square will be randomly generated using JavaScript. You can run this code in a browser on your smartphone or any other device.
Note: The code provided above is a basic example to get you started with generative art using JavaScript. You can customize and enhance the game according to your preferences and requirements.