I think this game has such a low rating because there are no in game instructions. As it says in the description box above: "For tutorials please run Liquid Measure 3."
I think I found a bug. I've played this game once before and everything was fine but this time, after going left from the cabin, I entered a tunnel and ended up in another world. Sly is free falling through a grey landscape and won't stop. Great screen saver though.