Yep, that's the end for now! The final version of DWAD will have a few more cutscenes and give you the chance to pick a Sin, but aside from the other imp routes that's all that's there for the time being.
Cool! I'm pretty interested in the premise here, is this gonna involve stuff like building up an army/base/settlement/etc.? Always a fan of those things.
That's the goal, yeah! The plan is that you'll be able to construct a variety of idols for passive benefits or access to unique items or mercenaries using materials that you happen to find during your expeditions.