Ah, the TWEWY of Touhou Game Jam.
So yeah, agreed on the rest of the comments about the concept. Twisting death into utilizing fire and ice elements is a nice combination of common game mechanics and it really works here as a concept. But I do really think a fair amount of the development time is mismanaged when it comes to the controls. When working with Unity it's usually recommended to tweak and obsess over your game physics until you're really happy with them. In the case of this game, the floaty momentum-gaining physics really clashed with how you had to navigate your character precisely to where you want them to live or die, especially when you're controlling two characters at once, which is a hard enough feat for the human brain on its own. I'm impressed by the number of levels you put out, but seeing as it comes at the price of these controls I think it might be best to consider quality over quantity for these complicated concepts.
It's a shame this isn't a physical on-location jam, because this would function great as a local co-op game. Maybe to circumvent a lot of those problems you could add a feature where the fairies can join and move as one unit that dies in one hit but is one thing to control, then re-split when needed. It's not perfect, but I found myself just wanting to navigate sometimes. I think Marisa had my favorite bullet spread btw, I felt I could actually strategize around it. Reimu's came in too frequently and was so direct in hitting both characters that it added too much to the equation, and Aya was Hooo boy. Marisa's came with a nice break but still had enough firepower to pose an interesting threat, and I think that's the best way to model bullet patterns for this situation.
I can tell some nice thought went into the UI, and I dig a lot of it, but on the other hand it comes with some UX nitpicks. For one thing, the sign effect is really nice and kept a nice gameflow without having to pause, but would always just be a nuisance to whatever hazard is going on and probably should've been in a safe space. This also made me miss the sign that mentions how to fast respawn the first time around, since it was at the end of the first level where the risk was high. Also the font was a bit hard to read, since the plain black text wasn't exactly popping on the detailed dark ground background. As a quick fix, adding outlines to the text tends to help that. Also God Bless for making volume settings since the music was way too loud by default (but on the other hand, the music was way too loud by default).
Anyway I really liked trying this out. Controlling two things separately is such a hard thing to work with, so this was some really great work. It was grand in scale and pretty good with the follow-through, but I think could have used a dev cycle that was more focused on the game's feel )and understanding how a player will learn these concepts) rather than having mass amounts of content. No matter how many cool ideas you get during the jam period, it's super important that the player will want to see them through when they play. Looking forward to see any future jam titles from you if you plan on it!
(oh so were all the graphics and music made by you too? Asking for ZUN Awards)