I was skeptical but impressed, too. I created a .py file that started with a comment something like:

  # this application uses PyGame to simulate fish swimming around a tank using a boid-like flocking algorithm.

and Copilot basically wrote the entire application. I made a few adjustments here and there, but Copilot created a Game class, a Tank class, and a Fish class and then finished up by creating and running an instance of the game.

Worked pretty well on the first try. It was definitely more than I expected. I wish I had committed the original to GitHub, but I didn't and then kept tinkering with it until I broke it.