According to ESRB this game contains: Violence
Parents don't have much to worry about. The game's violence is completely over-the-top and cartoony, with no significant levels of blood or gore. Your kids see worse than this on Saturday mornings. The difficulty level is pretty brutal for younger ones, though. Prepare for heavily frustrated kids unless they're doing two-player. There is no questionable language or sexual content.
Fans of 3D brawlers will definitely want to check the game out. The levels look great and play even better with a high level of interactivity. The control scheme is also complex and satisfying when you have breathing room with a live person. However, be warned- the game is repetitive and dull when playing the solo mode. Rent it first if you have no friends.
50's Sci-Fi mavens should look into the game for its faithful recreation of the motif. Everything comes together as fine homage, from the "drive-in" appearance of the front end and menus to the campy faux-film posters between levels. This game has much retro-cool.
Deaf and Hard of Hearing gamers will have no problems at all. There's almost no story in the game, no spoken dialogue, and no significant auditory cues. Absolutely equal access.