Bretty good, there's a lot of work put here with patterns, diverse enemies and bosses, rounds feel distinctive enough to not be too same-y. I'm afraid you still have to rework at least some of the graphics, when the level is dark it's too dark, when it's bright it's too bright, some sprites look very basic like these palm trees in level 3 or background rocks. It all makes the game feel like a flash game. I noticed some of the sprites were scaled up like the scarecrow or the ships and I think it looks cute when the game uses pixel art, here it clashes too much. Then again I like pixels and I might be biased against your art style (I don't like touhou look too).
My heroine phased out of reality on two runs, one during the fight with the crow, another one when fighting Chelsea. When moving back and touching the left side of the screen your player gets "recentered"? Also game started with ~60 FPS and by third level went down to 40 dipping sometimes even lower. Maybe there's some optimalisation missing but then again web builds are often slow like that.
It's a valiant effort, Bullet Hell mode is much more fun than casual, more phases for bosses make it much more challenging, I even managed to get 5 lives but my disapperance at 3rd level boss broke my spirit.