As long as games can be played offline, that's fine with me. I don't think my wife wants her putting games on her phone much, unless they are free. Currently she's been playing the crap out of Undertale on Steam via our Linux desktop computer.

The thing about Japan is that although there are adult men who may fetishize the whole schoolgirl aesthetic, schoolgirls themselves are not sexualized. They are forbidden to wear makeup, wear pierced ears, etc. I see some girls who are 15 and still haven't begun shaving their legs yet. There's more of an innocence here.