Okay, i have a lot of things to say, first of all, is not a bad game, on the contrary i liked it a lot, but is a little bit unpolished.
One thing that it lacks and is really important is a tutorial or a key explanation, like, the first thing i did when the game started was try to move with the awsd keys but i lost life trying to figure that i was supposed to move with the arrow keys, this is important because people can play the game and don't know you can do something, for example i wondered that maybe i could focus using shift like other Touhou games, and i could, but if i didn't know anything about this kind of game i would have never figured that out.
I also tried pausing the game and figured i was able to do so with the escape key, i was in the second stage and in the screen appeared two options below a "Continue?" text, so i clicked on the "Yes Yes Yes!" option but i went back into the main menu. I don't know if i was the only one with that issue but "Like hell i will!" was for continuing the game.
The power ups are busted, in the first stage i collected every one i could from the fairies and decimated Hina, like she was dead before she could shot one bullet from her spellcard (this also happened with the last boss, i think making them invulnerable while they are activating their spellcard could solve this).
One minor nitpick i have with the interface (the ui in general is pretty good) is that when you have the text at the beggining of the level telling you where you are it appears behind the objects of the game, so if i go with Reimu where the text is i can cover a little bit of it, also i can still move while in loading screen and the character is still visible.
The art of the characters could use a little bit more of work in the anatomy or proportions i think, they were nicely colored and their expressions were good (i think cirno had the best faces).
Also when you kill an enemy they just dissapear, it would be nice to add like a particle system so it spawns white particles like an explosion when you defeat them.
Overall it was a nice game with a lot of potential.