I mean, I think it's targeted less at people who want sexual gratification, and more at those who enjoy a well-written story with ethical questions that just happens to involve mind control. It's definitely not your typical eroge,* and it's not to everyone's taste.
But as someone who has that fetish, (and who got this game half-expecting a more typical mind control game) I find it kinda refreshing. So I guess I'm the target audience? But yeah, there probably aren't many like me.
*Or arguably, an eroge at all, though there are a few nude scenes.