I didn't realize it was so simple. So the winner is:
Alex, then KuzyaHG, then mi2 and then rob (in alphabetic order)
or
Alex (37.06), then mi2 (66.07), then KuzyaHG (71.28) and then rob (78.52) (in solving time order)
or
rob, then mi2, then Alex and then KuzyaHG (in in submission date order)
I like very much the Votart solution, and my initial idea of the solution was in this direction. For this reason I propose Votart as winner (I'm sure he has a lot of interesting levels ready), obviously if all of you agree.