Tried it out and it is a good start!  

I would recommend adding some more "flair"? if that is the right word when you get a card correctly, showing how many points you get when you complete a set of cards before the next hand is drawn.  Additionally, it seemed like the countdown timer jumps even before two correct cards are fully visible?  It might be good to pause the timer while the second card is shown either correctly or incorrectly.