Posting my opinions here just so it doesn't clutter the thread, but overall:
-The shottypes are REALLY tricky, but not exactly in a bad way. (Unless we're talking Marisa, I legit hated every single aspect of her shottype!)
-The bosses are all super cute
-The danmaku is incredibly fun and stages enjoy putting you in places where using your shots' gimmicks count, so things like Sanae's waves or Sakuya's bouncy focus shot actually do feel rewarding.
-The bomb system is a bit strange, and from what I see you can pretty much regen the bomb gauge even during boss dialogue.
-OST is pretty nice, some meh themes, but some really neat ones too. Nothing really stands out, but I personally -loved- the stage 2 boss' theme. It's really beautiful! Title theme is really cool too!
-Whoever designed the stage 3 REALLY liked revenge-bullets.
-The demo-end-cliffhanger looks really cool and it actually makes you look forward to the full version!