fullscreen: If true (1) enables fullscreen for desktop targets. Currently there is a bug with desktop fullscreen in that the native screen size is not used, and instead a default smaller size is used, leading to bad quality image. There also currently no ability to toggle fullscreen as runtime, or change resolution. Hopefully this improves in the future. update_frequency: How often your game goes through its update loops. Valid values are 60, 30, 20, 15, 12, 10, 6, 5, 4, 3, 2, 1