I can't play this game again, because it simply takes hours just to play 1 game. My third, and final game, my score was about 70,000 and this took several hours spaced out over a few days.
The graphics are great.
The concept is fun.
As I said, it takes too long to play a single game. But it is a gem.
Where it could be improved: the only new tiles are 1's & 2's. Having higher random tiles emerge would make the game a bit more exciting.