According to ESRB, this game contains: Animated Violence
Parents wont need to worry about their kids playing this game as there is really nothing risqué or violent in the game aside from the usual blowing up of enemies that a space shooter would be filled with. As an aside, playing Vanark with the digital controller was shaky and unresponsive so I would recommend using the dual shock analog controller when playing it.
Anti-Nintendo gamers and PlayStation loyalists who have never broken down and picked up any of the Star Fox titles available for Nintendo consoles all these years, may want to pick up Vanark. It controls identically and is not too hard on the eyes, but it will be over before you know it considering the game only consists of seven levels. Id recommend renting it first. For space shooting action, I'd recommend Colony Wars III: Red Sun, as it is a far more original and inventive title.