The movie is not interested in wrapping things up via a “smash the mirror” epiphany. It’s to Oliver’s credit that he’s taken a more tough-minded than easily cathartic approach. And Ansel Elgort’s wonderful performance does appropriate honor to the ambiguity the movie is trucking in.

Glenn Kenny

RogerEbert.com

For forty minutes we become intimately aware of Oliver’s sci-fi conceit through heightened emotions, visual puzzles, and potential betrayals. It’s the perfect set-up for a thriller built on exclusion and yet it becomes much more.

Jared Mobarak

The Film Stage

Elgort does great work juggling what is essentially a dual performance, while Oliver, making his feature directorial debut, here, keeps things clipping along at a taut, engaging pace. Small in scope, yet successful in just about every aspect of its unspooling, Jonathan stands tall.

Warren Cantrell

The Playlist