According to ESRB, this game contains: Blood, Mild Fantasy Violence, and Use of Alcohol
Parents don't have anything to worry about. The game's animation is so poor that there's no real chance to see anything approaching influential blood or gore. Parts of the game take place in a tavern which accounts for the "alcohol" in the ESRB's caution, but otherwise everything is fairly harmless.
GBA gamers looking for those last few hidden gems can feel safe skipping this one. It has a few good ideas, but the execution is poor and the game feels like far more trouble than it's worth. There are tons of other games which provide a better dungeon crawl experience than this one. My advice is to instead pick up the ultra-hard-to-find Back to Stone from the same publisher—it's not quite the same genre, but is a far superior product.
Deaf and Hard of Hearing gamers won't have any problems. Everything in the game is presented either visually or through text during conversations, so no hearing is needed to fully "enjoy" the adventure. I may have other issues with it, but it is fully accessible.