Thanks Towelie for your nice comments.

I will try some of the suggestions by Error and Towelie , but i am really happy with that what i have so far , because it will be harder each next level you reach , belive me .

Also i won´t give the player the feeling , to loose in just a minute

Another thing that came in my mind and maybe make the game harder is that from time to time the game notice the empty places at the bottom and place blocks there , now you have to place a Bomb on a block to get this place free again.