Funnier than expected in its snarky riffs on horror, but persistently witless in its slasher plotting, the romantic-horror-comedy Heart Eyes juggles genres with gusto, but the act still falls flat.

‘Heart Eyes’ is a meta slasher comedy in which ... Right on cue, Detectives Hobbs (Devon Sawa) and Shaw (Jordana Brewster) are called to a crime scene where a couple was found slaughtered ...