To be honest, I didn’t expect to like Project Hail Mary. I assumed that the decision to reveal the book’s biggest plot twist in the trailer was a mistake. I thought that the two-and-a-half-hour runtime might be too long. I worried that a hard sci-fi story like this one would be hard to translate into a feature-length film. Thank goodness I was wrong.

Project Hail Mary adapts Andy Weir’s novel of the same name. Indeed, that’s the same Andy Weir who wrote The Martian. Ryland Grace (Ryan Gosling), a molecular biologist, wakes up in an interstellar ship without his memory. With everyone else on board dead, he must find the answers to two questions on his own: who he is, and why he’s far away from Earth.

Though a soul-searching mystery might be entertaining in its own right, it wouldn’t be an Andy Weir story if it didn’t have some MacGyvering in space. Grace’s mission is apparently one of global importance. When a spacefaring virus starts to feed on the Sun and other surrounding stars, Earth sends a mission — that is, Ryland Grace and his deceased crewmates — to Tau Ceti, a faraway star somehow immune to the so-called astrophages.

Less problem solving, more emotion wrangling

Despite Weir’s tendencies to throw his protagonists into problem after problem, Phil Lord and Christopher Miller, who directed the adaptation, offers a more emotional story. Now, make no mistake; the original novel is already a tearjerker, but the film ups this even further by masterfully adapting the story’s most iconic character, Rocky.

Upon reaching Tau Ceti’s orbit, Grace realizes that he’s not alone. He isn’t the first visitor to the mysterious star. An alien spaceship is already orbiting the star. However, far from visions of War of the Worlds, this particular alien has a single mission: to save their own star from the same astrophages.

Rocky, as Grace calls them, looks like a living rock. Initially unable to communicate with the alien, Grave eventually builds a friendship with Rocky by translating the latter’s chirps to human words.

In the book, Rocky communicates with Grace (and the reader) through the broken English from a translating software. Naturally, the film adaptation offers more creative freedom. Instead of just text, Rocky gets a voice, thanks to James Ortiz, who offers a friendly-but-snarky character to the alien. As a result, Rocky feels more like a sidekick than just a (literally) alien entity.

Though it comes at the cost of some science-filled problem solving, Rocky’s slight change is more cinematic and can tug tighter at the heartstrings.

A healthy dose of humor

Rocky’s voice isn’t the only change. Despite the long runtime, the adaptation already prunes or shortens plot beats from the novel.

To be fair, all these changes don’t detract from the essence of the novel. Sometimes, they simplify. Other times, Lord and Miller infuse their trademark humor, which can be jarring for those expecting a more technical sci-fi story. But again, the novel’s spirit is still intact.

If anything, the added humor keeps the film entertaining throughout two-and-a-half hours. Now, if you’re tired of the so-called “Marvel humor,” there are moments of slapstick and snark sarcasm that pushes the limits of typical movie tropes. It’s just the price that an adaptation like this has to pay. Project Hail Mary’s plot is too complex to condense into the archetypal 90-minute window.

As someone who read and loved the original novel, it was difficult to see stitches between the book’s story and the screenplay’s changes. And I think that’s what makes the adaptation work so well.

Should you watch Project Hail Mary?

Project Hail Mary is as faithful as an adaptation can be. It doesn’t change the story for the sake of Hollywood. All the changes you’ll see are just ways to keep audiences engaged because of the long story. If you loved the book, there’s no way you wouldn’t love the adaptation, too.

Now, if you haven’t read the book, firstly, you’ll still love this movie. It’s a highly compelling story with high stakes and an emotional rollercoaster. Secondly, read the damn book. It’s a masterpiece of science fiction.