Well, one can argue about how useful it is that blocks of ice with fish in it fall from the sky. But apart from that makes it quite fun. The difficulty is that on the one hand is shaking the boat and on the other hand the stones depending on how they come bouncing off each other. Allowed to complete a level with 3 stars the dog does not fall into the water and you have to meet a timing. There are various power-ups, for example, an anchor that keeps the boat to rock it back and forth.
All in all quite entertaining but not really outstanding. There are well-intentioned 4 stars from me.