That the perspective this time is from a girl’s point of view rather than a boy’s is significant. At least it is in theory. The scripter is Joe Kelly, who, along with J.M. Ken Nimura, created the comic. It’s not a knock to note that the main creative talents behind the camera are male — the women of the cast are clearly imbuing their characterizations with what they know. But there’s still something about I Kill Giants that feels projected, a work more informed by empathy than experience.

Glenn Kenny

RogerEbert.com

While the film isn’t as subtle as A Monster Calls or Where the Wild Things Are, it captures the messiness of suffering just as well.

Jared Mobarak

The Film Stage

Beyond the characterization of its complex anti-heroine, though, I Kill Giants doesn’t stray too far from an established collection of story beats, stretched thin over a slightly too-long 106-minute run time.

Katie Rife

The A.V. Club