Just to hard to be any fun
There aren't enough cards to chose from in a 3x5 grid to make many proper triplets at all. It's just too improbable that all four characteristics wouldn't match, and so the highest score I've gotten is 1.
If you wanted this game to be successful, I would suggest making the grid bigger, or making it so that only 3 characteristics had to be different. I know a) you made this game based off of an original game for your family and b) that would be hard to code, but if you want the game to be successful on the internet, you have to make it so that some degree of high score beyond a score of 2 is possible.
And if you were to remake the game, maybe some background music would be good. And the "GAME OVER" at the end really makes me want to play again (positive reenforcement is nice for internet gamers).