I love the way you make an usual memory game challenging by implementing crappy abstract arts into the game. The easiest way to play this game for me is to memorize each painting as some kinds of real life objects, but then sometimes when I see a painting that I decide to call it a banana, I see another painting that looks even more like a banana, and then I panic, forgetting everything I was trying to remember :p
I don't see how this game is much related to the theme "Light and Dark" though...