TLDR: Flutter made its debut at the Game Developers Conference (GDC) in San Francisco, showcasing the progress made in building games with Flutter. Over 15,000 new mobile games have been developed using Flutter in the last year. Flutter offers advantages for 2D casual games, such as being open-source, having a rich plugin ecosystem, and supporting cross-platform deployment. The future of Flutter game development includes expanded resources, smoother deployment on various platforms, and exploration of 3D capabilities.