The boss has way too much HP on each pattern! The patterns aren't crazy or anything, but the inflated healthbar also inflates the difficulty, and makes the easy patterns boring, and the difficult patterns much more difficult. Apart from this, it's probably good, but it really is a fatal mistake as far as my enjoyment of the game goes. I do like the game's take on both Miko and Byakuren, though, and the boss' "let's danmaku! win-win" attitude is just so Touhou.