A man and a woman kiss.

While a woman is being slaughtered by a martian machine, bits of her clothes fall off. No nudity

Lots of fake blood and gore. Many many explosions and shots of people burning up and becoming skeletons. A woman is trampled by a martian machine

None

The general idea of hostile aliens coming to Earth to wipe out humans may be terrifying to some people.

The general appearance of the aliens may creep some people out.

People are seen being crushed into bloody messes and burned to skeletons, but the obvious and terrible CGI may soften the impact.