This seemed nice but it isn't.
The controls are absolutely not intuitive, it took me about 10 minutes to find how to start a game.
Then - having played tens of mahjong games before - it was hard to identify the tiles, the levels.
The whole game is unfinished and ugly.
I think just extra 10% work would be necessary for it to be a good and nice game, half of it discussion with users and polishing the UI/UX.