Thanks for the kind words!
I have a laundry list of improvements to make once the competition's over and 'help page' or 'short tutorial' is definitely high on there!
About the images being too complicated, one of the other improvements is to sort and present the images by difficulty. I actually have this working but switched back to full random before submitting for the jam because I rand out of time searching for images that were simple enough to work with the concept. With the small set of images I used in the Jam build, if I sorted by difficulty, you'd be playing the same images over and over. Hence, a corollary improvement is to add more images to the collection. Anyway, sorting by difficulty definitely adds a nicer sense of progression to the game and helps ease you into the more complicated images.