None.

Some mild violent content, with some threats and implied violence.

Not much though.

One use each of h*ll and d*mn.

None.

Some scenes are quite effective at inducing vertigo.

Almost constant peril, as someone is just about always in danger of falling into the sky due to there being two different gravities that apply to different groups of people.

One scene near the beginning could be frightening to some.

Also, one side seems to want to eradicate the other, and so the protagonists are always being pursued by them.

Some emotional themes.