I'm not completely sure about your requirement, but as a game developer who uses Unity everyday, I would recommend it. Core graphics and UI components are avail

I'm not completely sure about your requirement, but as a game developer who uses Unity everyday, I would recommend it. Core graphics and UI components are available out of the box, and sometimes even when we need an app(nothing like a game) that need to access native APIs of the platform, we use Unity. It used C# as the default language, and platform-specific core logic can be separated within the code, using #directives so it's pretty straightforward.[edit: typo]