My only real complaint is that I needed some context to the world as a whole. We're left with three named locations after having a multitude of cities, towns, villages, and settlements in G4. Granted, I am sure the series will delve more into that, but the Dark Souls fan in me needs a tad more from that, haha.
That said, I will agree the film feels too short, BUT at the same time it does not overstay it's welcome. I'm 50/50 on that.