I really enjoyed this. The gameplay is fairly simple, but the difficulty scales gradually, and the cutscenes mixed in with the gameplay keep things interesting as the story unfolds. I appreciate the little touches, such as how every spirit looks different.
The music is otherworldly and haunting, so just right for the theme, but the loop is too short; it begins to sound repetitive quite quickly.
The angry spirits that try to stop you did not immediately read as hostile for me. It was a while before I realize that oh, that's the reason the spirits are returning to the well.
I also got the impression that diagonal movement was faster than movement along the X or Y axis... it might be my imagination, or you may need to normalize the vector. :)
Lastly, the text in the cutscenes overlaps with the names over the graves. I think the black band at the top of the screen should hide the grave names.