The game has a lot of personality with a fun look and charming critters. As others have said, the controls are not great. Occasionally you'll run your sheep into the water or fail to get them to move and you won't be sure why. The difficulty isn't too bad. You're rewarded for being very quick, but not punished for being very slow, so you can continue past some of more demanding puzzles without much frustration.
Other than the controls, one issue I have is with the load times. They seem too long considering that every level seems to look so similar and it's a downloaded title.
At $15, I'd definitely check out the demo before purchasing. It's a fun title, but the price is too high to recommend outright.