Holy heck, that was enjoyable. I didn't even expect a story. And.. maybe that works against you. Knowing that there is more to this than just spotting similarities, I would suggest probably having an introduction before the game-play, just to dip your toes into the world before you go to work fixing it.
Only other criticism I have would be just having a indication on the "book of quotes" that it's time to click to continue. Idk if it's just the right-hand page, but I wasn't able to click on the left page to continue, and that makes sense from a "reading" standpoint, but it may not be straightforward enough for the rest of players.
Turning the spot the difference game on it's head is an extremely cool idea, and I look forward to the rest. You have a solid idea. Good luck!