Yeah, smart games spirit is strong with this one :)
This is one of those puzzle games, where you go "just this one, and I'm off to sleep", but then you do another one, and another. Then it's late, but you had a ton of fun :)
This is also an original take on the theme. Most games I played so far have the player operate in a space that's limited, but this is the first one I played, where it's your task to limit the space.
Another strong point- the audio. First of all- any game that has voice acting gets kudos from me. Any game that has passive-agressive hint system... well, it certainly motivates you to think once more, before clicking :)
Two things that I'd change. When asking for a hint, you could ignore the pieces that are in a correct position, and go to the good stuff right away :) The other thing is- the first time I used the hint system, I was certain I got everything right. It would be fun to see the "sheep" move to the exit, or at least have the path marked. That way I'd know where I need to fix things, and also, I wouldn't have to be told off by the hint button.
Last thing- 40 levels is a lot, and it's late, but I'm definitely going back to this one :)