I'm really enjoying the game so far. One thing that stood out to me though is BB's personality change. I like his new personality, but it felt a little too sudden.
I think a slower transition would feel more natural or maybe just letting MC acknowledge it earlier on shift 3 like *oh you do talk*. That way it's not necessary to rewrite two whole shift as the author suggested to save time.
Update: You know what finished the shift 3 she shut my mouth. I grew to LOVE BB on this shift to the point I forgot about that detail. She outdid herself.