Fun, but sometimes too little going on

I've really been looking forward to the full version after I played the demo 2x.
The game is a lot of fun (at least most of the time). Positive points have already been explained in detail in the other reviews.
Negative, I find that you can not speed up the modem speed of the game, because it really can be very boring for experienced players halfway between the shafts (Adventure Mode). Furthermore, I find that some level Video- just lngweilig the difficulty is ok for children, I feel challenged (often comes the thought, "Oh, that's it with the Huge Wave?" :) I build almost every level and have the same has never lost. That's a little bland.