I went into this one not knowing what to expect, other than that it would be dark and mostly grey. I was very pleasantly surprised by it.
The visual style of this game is unique, with a mixture of pixel art and manipulated low-fi photos all with a one-colour-plus-grey limited palette. There are lots of great little animations; the animated battle backgrounds stand out in particular. The whole thing has a sort of (neo?) Victorian, gothic horror vibe, and it's all very consistent and well done.
The story is dark, and the warnings at the very beginning are much appreciated. For anyone reading this and thinking about playing the game, be advised that those warnings are there for a reason and it's not just the creator being overly careful. I did finish the game but it was definitely skirting the edge of what I'm comfortable with. Once again, though, neo-Victorian gothic horror with maybe a touch of Lovecraft, and done quite well. The ending is ambiguous but I like to think it's ultimately a hopeful one.
It's off the beaten path of mahou shoujo, and while it's not the sort of thing I'd normally go for it certainly stands out in a crowd and I enjoyed it quite a bit.
The music is well chosen and some of it has a low-fi effect that normally I'd be critical of but just works in this game. The sound effects are less memorable, but serve the game well.
The difficulty is spot-on. The major battles feel intense and challenging, without feeling unfair or unreasonably difficult. I did not have to redo any sections, though I came close to dying here and there. The unique soul type system is simple enough to understand and does make enough intuitive sense that even I, with my notoriously poor memory, was generally able to pick the right one.
I have a few nits to pick, and I think it's telling in and of itself that I only have relatively minor complaints. The item shop isn't adequately signposted, and I almost missed it completely. The random encounter rate is just a touch high for my liking, and random encounters were getting annoying toward the end. The first scene with Reapy was weirdly campy and upbeat in stark contrast to the dark, brooding tone of the rest of the game. Finally, having to remember phone numbers feels like a throwback to the old days of gaming, and not in a good way. I wish these were just discovered and remembered by characters, or went into a note in your inventory.
While it's not for everybody, I enjoyed this game a lot and I think it's one of the strongest entries in the jam.
EDIT: One other minor nitpick: Reapy's jittery movement sometimes results in them getting in your way. I've never gotten stuck, but I did have a brief moment of panic the first time it happened before they moved out of the way again.
EDIT 2: I realized after writing this comment and leaving a rating that the version I played was not the initially released version, and as far as I can tell it's no longer possible to download that version. While there is a relatively detailed changelog, I still can't be 100% certain the version I played is actually representative of the game at the time of its release. Had I known that earlier, I would have refrained from leaving a rating.