The flat design is fine enough, but the gameplay stinks! There's no challenge. You've made mahjong without what makes it mahjong.
The two self promoting buttons on the main game screen is also obnoxious. One is plenty.
Simple design, easy gameplay, music which doesn´t get annoying after some time. Since I am used to the "normal" Mahjongg, I think it was a little too easy, but it is PERFECT for beginners - because I know it can be very frustrating if you can´t finish the game because of one single block. Good job!
this is essentially just mahjong with an upscale in difficulty over time.