Exactly the kind of game that should be made.
The difficulty level and type by the way is comparable to some scientifically tested mental exercise games I have tried.
The game is very smooth, with high quality graphics. Two other very good games I have played that had high quality graphics that worked surprisingly well also suggested Russian influence. What game-making programs do they use in Russia? I want to use them...
I have gotten to level 120 so far, though I have also used up my rye bread.