If there is one word you cannot use to describe this game, it's short. I've been putting a ton of hours into this game, and I still see a lot of closed dots on my world map. I've generally been going through chapters only once as well.
Each time I finish a chapter, even if I get all of the gems on the first run, I still seem to get only about 60% complete max. Not sure if I'm going to go back and re-complete these other chapters. If anyone has, is it really worth it?