According to ESRB, this game contains: Animated Blood, Animated Violence, Suggestive Themes
Parents should be aware that there are a few scenes in the intro with a naked man and that some levels are splattered with blood.
Science-fiction fans will get a kick out of this game because its story is X-Files-ish enough to pique their interest.
Pure RPG fans should be advised that the game is really more of an action title than an RPG (despite it being listed as an RPG) and should also be aware of the game's dearth of RPG elements. For your RPG fix I seriously recommend Final Fantasy VIII. There are no spells or potions here, but it is menu-driven.