If you loved Knights of Sidonia: The Movie, try Godzilla: The Planet Eater
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Kobun Shizuno, and they both carry the epic mood tag, and they sit in Action / Animation / Science Fiction territory. If that's the register that drew you to Knights of Sidonia: The Movie, the second film will land in a comparable space — through a different lens.
epic
What Godzilla: The Planet Eater is
You fight for survival on a planet overrun by Godzilla, but then a powerful foe emerges, and the heavens shake once again. The film leaves humanity on the brink.

