According to the ESRB, this game contains: Blood, Violence
Parents should be aware that like any other first-person shooter, this game is all about firing various kinds of weapons and taking out the opposition. Although most of the enemies are big bugs or robots, there are a fair number of what appear to be soldiers in heavy body armor throughout the game. There is no blood since these enemies are supposed to be computer programs, but the appearance of shooting people is still there. There is no questionable language or sexual situations.
FPS fans looking for a fix on their PSP have very limited options since this is currently the only game available. In this circumstance, it's a bonus that the action is fast and the weapon selection is pretty decent. The graphics are great, and plays very smoothly. It doesn't do much more than give you hallways to run through and targets to shoot at, but it does it well.
Deaf and Hard of Hearing gamers should be aware that the music changes when enemies are present, and changes again when the coast is clear. It's not crucial, but it is helpful, so it's unfortunate that this audio information is not presented visually. Otherwise, all information is presented through in-game text, and there are no game-breaking bits of audio to be missed out on. I played approximately 75% of this game with no sound, and did not run into any serious problems.