I know how hard it is to make a card game with any software, and I am glad you have been able to and you had the chance to publish it and show us what you've been working so hard on. However, there are some things to consider for this game.
- While the color set for cards is cute and varied, I am unsure of wether they serve any purpose rather than aesthetics. If it doesn't already, you should include bonus points for following a pattern like same colors or alternating. If it does already, you should specify so in the HELP.
- The music is too loud. For a game like this in which the music is just ambient, it should be as soft and soothing as possible when it comes to volume. As well, I didn't feel it matches the theme of the game, so maybe work on that further on, but not essential to this game. Volume, though, was really off-putting.
- After a while it becomes repetitive and not very challenging. The mechanics are really simple, of course, but that's no excuse to make the game pan out for too long doing the exact same things. Look for Mahjong games that structure the tiles in different ways to keep the players interested in the game. Use examples to create your own.
I believe you are in the right path, and hope this advice can help you become a better game designer/developer. Keep up the hard work!