I liked it, reminds me of Gonbe/Otae from Muramasa Rebirth.
I liked the puzzles, having the ghost auto-move to a position instead of having to hold rmb is convenient, the initial placement of the "ghost-wall-rune thing" is smart as it intuitively explained how the ghost can't enter that area.
I really liked the art style, it definitely caught my eyes when looking at the cover image.
I feel like the ghost should heal a bit faster, just in case the player manages to be severely injured after the first enemy or so.
I look forward to seeing the update after the freeze period. :)