At first, I want to thank you for the game, but here's what I've noticed that it is necessary to fix:
The man paid for the game, wants to get the game test his strenght. A challenge! He should solve problems. Of course, the game problems.
Overcome difficulties, win, feel victorious. If he can not, then reduce the level of difficulty, if it happened, he increases the difficulty to make it harder.
Here, it turns out that the players, beginners, win to easily. Well, suppose I have a very good skill. But I played few times. The first time I did not finish until the end. The most of the players win without problems, and if you can not raise the difficulty of the game, you don't want to play it again.
Also we dont have a network game, as a logical extension.
The last word of the players.