This is oldworld storytelling. And it is an epic tale!
The story is both inventive and emotionally impactful. The story is so interesting that I feel it would be worth it to find out where the story draws it inspiration from. If you allow it the story can be very deep and allegorical. It reminds me of tribal stories of how the world began.
What really stands out about the plot is that it involves tons of growth, which is where many othe anime fall short. You get to see the main character evolve from a simple being into a complex, layered... (yet to be revealed). There are themes about how memory works, what makes good character, loss, kinship.
The one grip I would have is the awkward insertion of the enemy force. But I looking forward to watching the remaining episodes to see if it all comes together.
All in all. I love it.