I dunno I think it's worth buying for the graphics alone and cause it's such an awesome game. even it's too short but I intend on renting it again sometime soon.
Well what sold me was the art design, and general feel of the game. It's so unique and original that I just couldn't resist it. So I bought it and was finished in a couple of hours, thats why I recommend the rent. There is a lot of stuff that adds to the replay value as far as mini-games, but nothing so special that justifies a spenditure of $40 or more. But I would reccomend that everyone give it a try as it is a wonderful story, with great character design, and a beautiful (yet somewhat repetitive) score.
Yeah I loved everything about it. and what suprised me is that I took it for a complicated game where I had to find a bunch of little things on the side (like God Of War which is awesome too BTW)but it was really simple and I liked that about it.