Oh thanks!
The fact that the game has different levels of difficulty is thanks to my wife :D
When I showed the game to her, she said: "Why so hard? Make the gold to be gold and the bombs, bombs!" and I was in mode "B-but... I have a tutorial!" She destroyed me! What a harsh feedback! :D
So, I gave it a sleep and next morning I decided to implement the difficulty levels, and after watching you playing my game, I am incredible glad of it.
Please forgive my English, I just get up!