Sen to Chihiro no Kamikakushi, Shinsekai yori Recommendations
While watching Shinsekai yori, I couldn't help but feel it gave off a very "Spirited Away" vibe. It has some surreal imagery and aesthetic styles you'd expect from it, and both deal with yokai or demons who were formerly human.
Shinsekai yori has a *very* similar feel to Spirited Away, and Princess Mononoke. It very much has an epic feel that is just breathtaking and beautiful that is very similar to a Ghibli film. It is similar to Spirited Away, in that it is about the journey of children growing more mature, in a world of magical powers that they don't understand. With Princess Mononoke, it's a very similar setting, of a rural, medieval setting in Princess Mononoke, and a Post Apacolyptic/far future medieval setting in Shinsekai yori. Both have a very similar art style and epic feel, that impart deep messages.
Both titles have a great focus on world-building.The first arc of Shinsekai Yori serves as a world-building arc and Spirited Away explores its universe through Hayao Miyazaki's imagination. However, Spirited Away is a Ghibli movie aimed for younger audiences, while Shinsekai Yori targets a more mature crowd.