Sure! Here's an example of a generative art game implemented as a single HTML file with JavaScript:
This game creates draggable particles on the canvas whenever the user clicks or touches the screen. The particles move randomly and gradually shrink in size. Once a particle becomes too small, it disappears. The game loop continuously updates and redraws the particles.
Please note that this is a simple example and can be expanded or modified to create more complex generative art games.