If folks haven't done it already I suggest you check out the full game summary web pages starting here:
The Game Then follow the links to the explanatory web pages for the Introduction, Exploration, Combat and Story.
What sounds intriguing to me is that the levels will be non-linear. As they explain, you may encounter enemies that your party cannot beat, which just means it's time to avoid that spot, do some more exploring and then hit it later when you've gained some additional skill.