This is a fabulous game! I made a You Tube tutorial on making 'card flip' memory game, but you seem to have taken the approach to a new level.
I have just two minor issues. The first is the length of 'loading' time (and is anything actually loading?) The second is the amount of time given to complete each level. It's probably my poor memory but I couldn't get beyond three matches before the sun went down. I would love to see the PPTX version to see what's happening behind the scenes.
PS - Further to your comment on my Virus game, I have since made 'Mastermind'. I will be putting a preview version of it on the forum I co-admin soon. PowerPoint Creative