Ryan J. Sloan’s “Gazer” is an imperfect movie that should be given the time of day. A low-budget venture filmed during nights and weekends over the course of two years, Mr. Sloan’s debut feature is a variation on the paranoid thriller, a genre in which a lone protagonist is confronted by circumstances that call into question the basic nature of reality. Power and money, whether in the form of a corporate entity or a governmental institution, often figures into it, as does a level of narrative disjunction.