For readers of her autobiographical “Little House” books, it is pleasurable, if head-spinning, to share in the joy she finds in hard work and family camaraderie amid every hardscrabble pioneer situation. Rebecca Sonnenshine, the creator-showrunner of Netflix’s new adaptation of “Little House on the Prairie,” which has already been renewed for a second season, isn’t going for cozy. A veteran of unsettling works (“The Housemaid,” “Outcast,” “The Vampire Diaries”) who describes herself as “pretty dark,” she doesn’t quite give “Little House” the “Anne with an ‘E’ ” treatment—in 2017, the director Moira Walley-Beckett brought grim gray hues and post-traumatic stress to Netflix’s Green Gables—but she gets close. Visually, this new “Little House” is beautiful—sunlit vistas, saturated colors, eerily attractive actors. “I can’t help thinking about what you said—that this land isn’t open for settlement,” he tells Mr. Edwards, as they continue to build a house on it.