Well, for the past few hours, I've just been drawing animals! Now the game looks like this (these are all the animals I have, I still have to make about 4 more):
Since the symbols you're manipulating aren't numbers now, I'm going to have to make the rules be written in a symbolic way. I could just use words, but who wants to mentally translate "Panda" into the image? Symbols will be more direct and cuter.