Nice)
I suppose right-down corner mini-map should reveal content under the cards, but now it is not. Or it has another purpose?
Anyway, nice concept
The mini-map is supposed to represent your magnifier, it's primary gameplay purpose is to let you see the 'clues' in the room more closely. How useful it is depends on how small the boxes are, and what you can gather from the clues.. but while I tried to make them more intuitive, I'm not sure how well I succeeded.