The pics need more diversity - it's hard to play when one number is represented of "woman in doorway, white blouse, arm to the left" and another is "Woman in doorway, white blouse, arm to the right", next there is "blowjob scene" vs "blowjob scene", and "girl in school uniform" transforms into...."Girl in school uniform (holding a small present)".
The responsiveness of the controls leave something to desire as well, on the real 2048 you could spam left-down-left-down, with this, if you do the game only register a new command once the animation has been completed. There should be some input-memory. compare it to the real game, and it feels very slow.
Also, if I hold down and press left, when I release left, it doesn't re-register that I hold down. This is a problem with the original game, that didn't need to be replicated.
There is no need to keep spawning only 2s when you have a board full of 16+ pieces, spawn some 4's and 8s to speed up the game.
Some mechanics like unlockable undos, swappes, number deletes, row deletes, could be implemented. Less purist, but I think they can make the game more accessible.
The animation needs some work, as it is, it feels jagged.
All themes are very samey, vanilla, lovey dovey. Matter of taste, personally I find it boring.
EDIT: On reflection, I realise this comes of as a bit harsh, it's a game with lots of potential and anyone who liked 2048 is going to like this, if it's polished a bit.