There's a lot of stuff that can scare kids in Limbo. Worms falling out of the sky burrowing into your skull and taking control of your body come to mind. Deaths are gruesome too.

Wow no? Limbo is extremely violent. It’s death scene after death scene.

You have to throw the corpse of a child into a pool so the monster won’t kill you. This is a fucked up game to play with kids.