Marvellous game! It went beyond my expectations!
I just love everything in this masterpiece. If I had to choose one thing in the game as my favorite one, it'd be the character development you gave to, well, the main characters. It now belongs to the collection of well-written headcanons I've seen/read. I've read a few Touhou fan comics that explore what a character's origin could be, so I enjoyed this game's story to the fullest.
I've featured this game in my Jam showcase video. Not all of it though since it's got a lot to read through and I have to show the other games too:
https://youtu.be/DgMV-QbPx7g?t=7751