AniDB listed this as 40 mins per ep, but at least that HS release was of standard anime episode length (~23 mins). I wonder if the source has cut the eps in two, making it 6 eps in practice, not 3. Or maybe AniDB is simply wrong.

Hard to say anything definitive based on the first episode. The world reminds of Ghibli with the spirits of myriad organic shapes wandering around. It's equally difficult to judge the character yet, either. At least the main girls insecure personality is sufficiently explained and founded by her long-suffering past.

This could potentially be jolly good.