Seems like a solid prototype, but it's lacking a certain je ne se quois...maybe a narrative arc, a sense that the characters accomplished something beyond just walking a hundred feet through a vaguely cemetary-like place?
Also, the combat felt tacked-on. Maybe it would work better if there was more to the enemies than dangerous punching bags, and if the ghost participated in combat beyond a healing aura, but maybe the game would shine more as a combat-free puzzler.