In terms of the code, I don't think it would be hard to create an Angry Bird clone of this quality using a GPT-4 scale model that had somehow had all knowledge of Angry Birds excluded from it.
Some of them make no mention of Angry Birds - "Wooden box. Large skeleton bone. Item assets sprites. White background. In-game sprites" - but others do: "Item assets sprites. Wooden planks. White background. In-game sprites. Similar to Angry Birds style"
My hunch is that a skilled image prompter could still get to results that were right for this particular demo even with a model that had not seen Angry Birds assets before.
It is? OK, tell them to completely clear the model of any angry bird original and clone code, data and assets that it scarfed from the Internet.
It can retain scarfed definitions of angry and bird as well as scarfed information on making a 2D video game.
Then tell the model to create the game and see what if anything it comes up with.