It's okay, I like the art very much but I've only read the three current trade collections during my lunch breaks at work spread out over the course of several months as the released. The story seems decent enough but I can't quite piece it together enough to give you a decent explanation. Creepy house, ghosts possessing people, keys that unlock doors that do magical stuff like make you big or let you see inside a person's head.
If you find you like it I would also recommend Sandman, Unwritten, Freakangels, Fables and Preacher. Sandman and Preacher in particular since they are complete and you can read them from beginning to end without waiting.
A while ago I borrowed a PSP from a friend for the express purpose of playing this game. Now when I played it I was recovering from getting my wisdom teeth removed as was drugged up on painkillers. I barely remember the game at all, but I do remember Evil Lord and Princess modes being very different. Princess mode was like a sidescrolling shooter and Evil Lord mode was almost like a mini RTS. Why did they change it? I liked it the way it was.