[19][20] In February 2023, Dark Horse, with Critical Role and Amazon Studios, announced a new interconnected prequel graphic novel series for the animated show The Legend of Vox Machina which will be written by Nijkamp with art by Tyler Walpole.

"[24] Publishers Weekly stated that "A highly diverse cast of characters, paired with vivid imagery and close attention to detail, set the stage for an engrossing, unrelenting tale.

[30] CBR stated that "Nijkamp's previous work, the widely acclaimed prose novel This Is Where It Ends, had provided an unflinching, heartbreaking look at high schoolers confronting horrific violence in their midst.

While The Oracle Code is nowhere near as brutal as its predecessor, Nijkamp's first foray into the comic book medium similarly doesn't pull its punches when it comes to depicting the emotions experienced by its protagonist.

Club wrote that "Nijkamp made her comics debut last year with DC’s YA graphic novel The Oracle Code, a compelling psychological thriller about a teenaged Barbara Gordon dealing with the recent trauma of a gunshot wound that left her paralyzed from the waist down.

[33][34][35] Jennifer Melzer, for CBR, highlighted that Nijkamp's "insight into these beloved characters made the story itself feel like the reader was there in Exandria, following closely behind the twins and growing ever closer to understanding exactly how they became who they were before joining forces with Vox Machina.

Bailey and O'Brien's deep love for Vex and Vax shines through in every moment, as if their voices whispered in Nijkamp's ear while penning their adventure and expanding the canon lore".