This week's spoilers
I agree this is probably the best fight scene we’ve had so far, though for like 99% of it I was pretty bored.
Personally I dislike how クソ兄貴 uses his powers here - it kind of made sense in other branches when, maybe subconsciously, he invokes his power after Miyako is turned to stone, or after Sora disappears forever, or after everyone is turned to stone. But here I feel it makes zero sense - dying, according to the lore, means you lose your contract with your artifact. Shouldn’t クソ兄貴 immediately lose his power to redo things?
The fact that the game shows both “redoing things” and “installing memories” as choices kind of gives them a sense of will - that it’s something that in some way クソ兄貴 decides. He can’t decide if he’s dead. I guess with some stretching someone could explain it away - something like it’s a クソ兄貴 from another branch invoking the power that brings the memories from the other branch or something. My main point is, his power feels totally like cheating - he can redo everything, and that makes everything irrelevant since his power has no flaw of any kind. He’ll win anyway. If he can’t now, he can just go back further and find a different way.
I also feel it’s way too… instantaneous? like installing memories of himself dying (which I imagine includes the pain he felt as he died) and being able to react immediately with zero hesitation in the middle of a high-paced action scene feels way too much to me.
Still, I liked how it ended, because finally the VN kind of cleverly combined all of the heroines’ powers to defeat the enemy and I felt it was a nice combination of teamwork that made sense… well, except for one detail that I found odd. Miyako steals the artifact from Iris, but Sensei doesn’t die anyway, The only explanation is that Haruka “does something about it”, but it’s never explained what, which is odd precisely because the game has gone through a lot of trouble to emphasize that things turn out how Haruka wants them only when she can actually imagine a path to that ending. Even the whole thing about how Kakeru stopped feeling pain in battle was achieved by Haruka wishing he pumped out more adrenaline.
LOL. I think this is the first time a remark from クソ兄貴 actually made me laugh. Loved the half-annoyed “そうだろうな” reply from ghost from such an obvious remark.
I kinda enjoyed the new Ghost. Aside from the already mentioned we-don’t-have-enough-budget-for-another-sprite thing, I felt it made sense because how strongly Ghost is a person in クソ兄貴’s mind, and how in his mind (s)he’s associated with the whole 幻体 power. It also explains why she still has that edgy personality.
I liked the post battle scene and seeing Haruka grow even more as a character and starting to gather more confidence in herself.
I didn’t expect to see Ghost sweating nervously, and much less for a reason like this 
I am wondering what’s left before this episode ends (I mean, aside from the obvious romantic developments). I am imagining episode four is finally the branch where the gate between the two worlds is sealed for good. I would love it if somehow episode 4 maybe just concentrated on Yuuki and クソ兄貴 working together on something like that without any actual antagonists and without any battles. Very unlikely, but a VN-reader can dream, no?