Hard old-school action-adventure with some issues
This is a challenging platformer where you play as an adventurer facing levels in various settings (mines, jungles, mountains...) where everything is trying to kill you (traps, snakes, spiders, piranhas, yetis, vampires, mummies...).
It's entertaining and can be played on the same computer by up to four players, either co-op or in a deathmatch mode.
The deathmatch is, ironically, the best suited for kids. Violence (characters exploding, being shot, etc.) is fairly stylized, non-graphic and cartoony.
The adventure mode has two problems. First, it's hard. Like old-school, keyboard-smashing hard. I can imagine younger players getting frustrated. Second, it features a somewhat disturbing gameplay mechanic which allows players to sacrifice characters and creatures to the statue of goddess Kali for in-game rewards. It's completely optional (I didn't even realize it was possible for a long time), non-graphic and tongue-in-cheek but the concept strikes me as quite violent, disturbing and messed up for children. I guess if you do a co-op run with your kid you can just make sure he stays away from the altars.
Sexual content is negligible (damsels in distress kiss the player if saved). I imagine such a thing, common in videogames when I was a kid, could be considered sexist today, but I think it's quite harmless.
Monsters are mostly non-threatening in appearance thanks to the cartoony art design.
There are shops the player can steal from, but the game doesn't encourage theft (shopkeepers are formidable foes who turn hostile and obliterate players at the first infraction).