Unfortunately, I wasn't really able to see the new content, since my last save file was during chapter 3 and the new chapters are at the end of the game. I think there were some tweaks (maybe to the drop rates and copium?) but in general it felt similar to the version I played in MGGJ9. The complexity is its greatest strength and its greatest weakness. It's still a bit clunky, and I wish some things like repeating gacha pulls and checking status conditions didn't require as many keystrokes.
The devlog is nice and meaty. There's quite a bit of detail, it's well written, and it talks about what was added and why. I do wish it went into the development process a bit more but that's my only minor complaint.