Yeah, I just feel it wouldn't have been so hard to just recycle some scenes from the episode until these events happen in the show and then switch to the real opening animation later :/ Hidden spoilers are fine (think Yuuki Yuna OP), but this is a bit extreme. It's going to be pretty anti climatic now, whenever it's revealed
Oh well.
I love love love the stylistic choices in Yuuki Yuna. Everything is just so pretty, from the backgrounds to the characters and the costumes. Apart from the two you mentioned, it fondly reminds me of some other good shows as well, though I'm having trouble putting my finger on which ones exactly. The interesting thing about the ending was, it felt both very neat and contained as far as Yuna's story is concerned, but we don't know about the rest of the world, the principal problem still exists. I like that. It leaves a lot of room for speculation.