A sci-fi-come-horror film about identity confusions, fits into a kind of thematic lineage from Primer onwards. I think it's very good, though it could have been even better given how great the set-up is. Filmed in the director's own house on little to no budget, as I remember
there was a much better article than this drawing links between Coherence, Primer, It Follows and a new kind of indie sci-fi film....damned if I can find it again though, so the reddit'll have to do