I beat it!
I like the big wide swing of the sword attack; it's fun and satisfying to use. Sprites have a great art style, and the writing is pretty charming. Yeah, the ghosts are pretty difficult to deal with; however, it becomes decently manageable once you know to only hit the real ones and ignore the fake ones. I didn't like how sometimes they would follow you into the next room, though. Not sure if that was a bug or intentional, but it seemed unreasonably unfair.
Revolving multiple aspects of the game (the player's afterimage ability, the enemies, the boss, and story) around the jam theme was a really clever idea, and you executed that really well.
Didn't find the afterimage ability that helpful, honestly. I think the fact that you dash the same direction you attack limits its potential. If you dashed in the opposite direction of the mouse cursor, I think it would be much more useful.
Thanks for refill the player's health before the boss fight. That felt fair considering the gauntlet you have to get through to get there.