Piece Together is an animated puzzle game that I built with a fairly heavy reliance on agentic coding, especially for scaffolding. I did have to jump in and tweak some things manually (the piece-matching algorithm, responsive design, etc.), but overall I'd wager that LLMs handled about 80% of the work.
I've never seen anything like it since the original days of the game "The Island of Dr. Brain" released in the early 90s.