I think that available headers for Lazarus Game Dev edition aren't as important as things like level designers, etc. - Let's face it, libraries/headers can be easily learned, but what is not as easy is getting levels to work. Sure, you can write your own tools, but that takes time & is reinventing the wheel for the most part. What I'd like to see if it'd be made is level designer for 2D games (and in distant future 3D as well) that'd be based on form designer code. You'd have components like Sprite that would take ImageList, etc.