It's extremely rare that I see something that makes me stop and think "this is just extremely my shit" as often as I did during Sweetheart, the sharply-scripted, smartly-directed creature feature from Sleight filmmaker J.D. Dillard. Produced by Blumhouse, Sweetheart is a genre-hybrid character study of Kiersey Clemons' Jenn, part survival movie, part monster movie, part relationship drama; all centered around how the young woman finally learns what she's capable of when she wakes up stranded on a small island... and soon discovers a monster lives there too. Dillard proves himself a master of …