By: Addison Wylie Secret Santa has been made to entertain, and entertain it does. Mikey McMurran’s horror throwback pays homage to an era where slasher films ruled exploitation cinema.  There was an unlimited supply of blood, actors camped it up, and synthesizer stings sliced through any scene with a hooded figure.  If you’re looking for visual and audio cues in a surface-deep tribute, you’ll be satisfied by the Cambridge native’s low budget lark.  Secret Santa…