Now...THIS is how you make a puzzle game
Anyway, It looks great, has great sense of humor, the puzzles are fun as hell, while being very challenging. And don't worry that it will end to soon: the built-in editor is easy to use, but powerful. Already there are many fan-made levels available for download.
SImply put: if you love puzzle games, especially Lemmings don't hesitate, download the demo and I can assure you that 60 minutes later you will buy the whole game with happy smile on your face :)