Mm AK, I put "imply" because even if they chose not to do a sequel, you still get that impression from the ending. It could just be Shaw and David off to explore the universe to end it.
I can definitely see things play out as you put them. Shaw *bleep*s up their entire planet, one manages to take off, though with massive amounts of eggs on board, gets killed, and crash lands on LV-426.
Some of the deleted scenes can be seen here. Most explain a lot of the things that people had problems with.
14 minutes of deleted scenes