I might want to use this for my entry, so I’m putting it up for free download to avoid cheating.
Just some loader code for PSD images, you can retrieve image data for each layer in the image through pointers to regular 32-bit ARGB pixel buffers (with individual bounding boxes and positions in the image). Haven’t tested it extensively, and it will probably crash for some images… but if it works for you then go ahead and use it. My idea is to do level layout and similar stuff in Photoshop to remove the need for a level editor. Being able to draw scenery (and collider geometry?) in multiple layers should be enough to make something interesting, and do it conveniently.