I was sad to see Trine did not make the list. It is such an absolute gem - and with the sale, it was briefly propelled into one of the top slots for Steam Sales. I guess the dollar figures just didn't add up enough - particularly when compared to juggernauts like the half life / valve sales.
Do yourself a favor and at least give the demo a shot. It has easily been one of the most beautiful and enjoyable games I have played this year. Much better than most everything on that list in fact.