I picked it up a couple of months ago. I'm on Chapter 7 right now.
The instant you see the Stained Glass windows platforming level, you'll be hooked. Not so much for the gameplay. There's really nothing special about its hack-and-slash mechanics. Kind of tedious, actually.
But the whole game is an example of Interactive Art. It's an experience that few other games provide.
I have the 360 version. I got it complete and "like new" for less than $10 on Ebay. Perhaps it's only a rarity on the Playstation.