Hah, I thought I had responded to that textures/pixels questions earlier, but I think I had started writing on my iPod, and then decided to type the answer at the computer instead, and forgot to add that part. PTK uses textures internally. You can see ALL the data in the headers if you look, for example, at KGraphicGL.h.

I think you're not understanding what PTK is. It's a 2d drawing engine that uses opengl/d3d for drawing, and has sound and input libraries and a few other bits and pieces to help deal with cross platform support for OS X and Windows. It's NOT a comprehensive game engine. It doesn't manage your sprites, it doesn't do collision detection. It doesn't keep track of your world or your levels. It works great for my needs, but it doesn't sound like it fits yours.