This hack is big as hell, and really pretty to look at. I liked the lack of a linear path, but it also made me pretty frustrated, particularly when I got to Golden Torizo and Ridley and didn't have Gravity Suit... but that was partially my fault for not exploring well enough ;)
I would have given this 4.5/5 if I could, but I'll just round up. It's not perfect, but it's as close as any hack I've ever played.