I to agree with SotC. What I don't agree at all is with Ico. I never saw it as a love story, but about companionship.
I meant to post the same thing last week; The inclusion of ICO is a baffling one. I guess you could argue that Yorda's actions at the end (And congratulations to that guy for completely spoiling most of the game) were motivated by love, but that's never explicitly implied, and it's a bit of a leap to assume as much. The way I read it was that ICO took Yorda with him simply because he was alone, and in need of a companion, and Yorda saved him at end because he was her only friend. It's strange to read anything more into it than it being a story of companionship.