According to ESRB, this game contains: Blood and Gore, Intense Violence
Parents should probably steer their kids away. It's a boring, tedious experience that I doubt many kids will enjoy, and the amounts of blood spilled during play are just ludicrous. I wouldn't say it's particularly graphic or offensive since the character models are so blocky and unsophisticated, but it's probably better to give kids something better to do than slice bulky robots into pieces regardless.
Action gamers or fans of Koji Igarashi's work should also stay away. The action is dull and stiff, not to mention it just looks incredibly boring from a visual perspective.
Combo fiends would do better to look into God of War or even Devil May Cry 3. NanoBreaker is leagues behind the current wave of games, and spending good money on something like this would be a crime.
Deaf and Hard of Hearing gamers can look forward to text prompts for in-game instructions and text subtitles during cutscenes. There are no important auditory cues during gameplay, and all relevant information is presented visually.