According to ESRB, this game contains: Mild Fantasy Violence
Parents might be put off the by the Teen rating this game has received, but I have to say that I have no clue why this game got a rating higher than E. The only thing this game features is "mild fantasy violence," which is akin to Star Wars. About the only issue parents should consider is the frustration level. If a child is easily upset by difficult challenges, this is probably not the game for them.
Shmup fans buy this now—'nuff said.
Casual gamers will most likely be put off by the old school graphics and simplistic gameplay. They're wrong on too many levels to count, of course, but that's just my take. Adventurous gamers will find much to like here even if they're not "hardcore old skool". Good game design never goes out of style.
Deaf and Hard of Hearing gamers have nothing to worry about since sound is of minimal importance in this game.