The story is a basic one: Giant robots vs giant monsters.
The message is a blunt one: "Be careful to the environment"
The influences are as follows:
The wicked fun of the 1998 Godzilla movie (which was and is fantastic in spite of critical panning)
Combining all the kitch of the Mighty Morphin Power Rangers:
with a whole lot of homage to Starcraft 2 Wings of Liberty.
This movie is how giant robot verses giant monster movies should be done. The human characters aren't getting in the way or being shoehorned into a story that never really needed them they're integral.
The Kaiju in this pic has the same view of the Harbour bridge as I do from work.