Ima, Soko ni Iru Boku, Kaze no Tani no Nausicaä Recommendations
They are both set in a lands that seem inhospitable at first, but eventually we learn that they their are refuges within them. The vibe of the movie is quite the same. Shu's resolve matches Nausicaa's in that Shu wants to help Lala ru stay safe while Nausicaa looks out for her village and people in general.
Both have a similar feeling, main characters, and a dying world inhabited by few people. The two also deal with themes of war and environmental pollution in the future. If you enjoy one, you're sure to enjoy the other.