I love this game so much! very unique! I just struggled on the last stage (based on the designs along the border of the page,) info on how i struggled below picture in hopes of not spoiling! 
I can't seem to fulfill the red cross requirements, as it is in a space that cannot be moved, but the green squares also cannot be moved (from my attempts) and they are spawned in in the way of the red cross. (if that makes sense!) Am I missing something?