Some things I'm thinking about:
Judging from the screenshots, there appears to be something effecting the point item value other than the presumable +10 for every 10 graze, which is definitely a good sign. However, there doesn't seem to to be anything that modifies it circumstantially, which hasn't been the case since EoSD. (Unless ZUN has removed any indicators from the screenshots.)
The boss's bullets seem to be spawning at the far ends of those lines, rather than near her. I'm suspecting that they might actually be stationary bullets that gradually appear farther away, like Wriggle's "Comet on Earth." Then they burn up like fuses.
There's some kind of wisp on the boss's head. It also seems like Sakuya just died there, but she already collected most of the power items she dropped. I wonder if those two items to the right of the boss came from destroying wisps.
I think the boss has a cape, which means we may have another addition to the cape wearing 2hu club.