2.25 stars.
I'm not entirely sure Gone Girl really needs parodies of it, as I think the original novel is quite darkly humorous already in its second and third parts, but I suppose parodies are a thing, if you become popular enough.
As for the parody, well, I'm sure this was self-published, as a lot of the comma use was cringe-worthy, and I'm not that great a comma user, myself. Other than technical complaints, the book definitely has its share of misses, with juvenile humor and many elements that could've been funny but largely lifted unarranged from the original. On the other hand, it also has enough to have me chuckling every few pages or so, and even literally LOLing here and there, too. There is also some sarcastic commentary on plot elements from the original book that I didn't think worked that well, and the ending is more satisfying than the original (though that isn't difficult to achieve.)