If you loved Giant God Warrior Appears in Tokyo, try Attack on Titan II: End of the World
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.
You already loved

Giant God Warrior Appears in Tokyo
→
Try this next

Attack on Titan II: End of the World
What they share
Both films are directed by Shinji Higuchi, and they both carry the dread mood tag, and they sit in Action / Horror / Science Fiction territory. If that's the register that drew you to Giant God Warrior Appears in Tokyo, the second film will land in a comparable space — through a different lens.
dread
What Attack on Titan II: End of the World is
Trost District. Sundown. A distant horn. Eren breaches the wall, humanity's last stand. Titans swarm, grotesque parodies of man. All seems lost. Higuchi's sequel doubles down on practical effects.