After becoming the biggest Kickstarter funding draw ever for a horror features, “ Shelby Oaks ” certainly evinces popular YouTuber Chris Stuckmann ’s love of the genre. But while imitation may be the sincerest form of flattery, it isn’t necessarily the most rewarding for others to watch. This mix of found-footage, missing-person, demonic-possession and other stock narrative hooks too often feels like a compendium of ideas from other movies Frankenstein’d together, with too little effort put