The concept is really fun. I like the binbougami theme you're going for and it's neat to see how that's tied into the danmaku gameplay.
Also, the art is so cute! I love seeing the expressions of the characters and I enjoy the look of the game in general.
It took me a while to realize that you have to double-press the Shoot key to destroy the shields and I did encounter some graphical glitches after retrying multiple times. I also prefer if there were invincibility frames after Sanae got hit since I just kept getting combo'd lol.
Nevertheless, really adorable game!