I couldn't play this game at all because of the colors. I only saw two colors: yellow and everything else.
The solution was to change the background to an all black field and remake the jools to different shapes.
I created some new images, sized and formatted correctly, and posted them so anyone else with the same problem won't have to make their own.
Just copy the files into the JooleemPortable\App\Jooleem\data\marbles folder, allowing overwrite.