Leroux: You're overthinking it. The game sounds cute. I believe yokai have a tradition in Japanese folklore and there are countless stories about yokai playing tricks on humans. And I mean, even though it's probably less rooted in our culture, we do have a tradition of fairy tales about e.g. household spirits or mischievous pixies that you can blame stuff on in Europe, too. I don't think the average six year old would take that seriously and apply it to their own family situation. Children are able to understand metaphors, too, and if they even try to find a moral in the game's stories, I doubt it would be "whatever I do, it's not my fault"; it could just as well be "if other people act mean, they don't always mean it ways, maybe they're just under a bad influence / in a bad mood". So this could also comfort them and help them empathize with others, but frankly I believe children will just perceive it as a nice (or funny) story.
But yeah, occasionally I have these thoughts, too. Like when I read a novel for teenagers with a heroine who started out strong willed, rebellious and independent and ended up a hopeless romantic who didn't find life worth living without the boy she fell in love with. Talk about coming of age. :P
Yeah, you're probably right, and you even managed to spin it as something good, so I'll try to look at it in that way.
I guess my problem with it was a combination of Yokais being responsible for everything, really, from obsessive personalities to overeating, and how for as much as I love magical realism, I hate people's agency being taken away. It's one of the big reasons why I hate both prophecies in fiction and Twilight.