Reisen's shot type is super interesting. Her bomb is not.
The scoring system looks really neat. Lots of focus on grazing. When you're grazing, items fall very slowly. Moreover, when you're grazing for a certain period of time (along with other constraints I haven't figured out) you get bonus green orbs that add a ton to the graze counter. Also, graze resets (and is stored) per chapter.
As for music, ZUN steered hard into making spacey, alien-sounding themes, it seems.