I love this game, it was everything the demo was and much more than I ever expected it to be. If you've played the Haunted PS1 Demo Disk then this is just as polished as that but about ten times as long.
The puzzles in the game might be a bit hard to understand at some points (in particular the finger puzzle might pose a challenge in case you misunderstand what you need to do) but otherwise it wasn't too hard with figuring out what you needed to do in a particular area.