I have been playing Valheim with the nine year old (and also without, I just spent 2 hours recovering our gear after an unfortunate incident with a troll). It’s a wild ride, one minute I’m having a chilled trip down a river, the next I’m being mobbed by creatures capable of near instantly killing me.
@jon my favourite thing is that you can parry the trolls. Needs bronze gear IIRC and it eats stamina but is a pretty effective way of getting rid of them when you need to.
They're also really helpful if you need some trees felling...