Mmmm. As someone with clinical depression, I'm still not amused....
In a way, that's good, because the aim of this thing certainly isn't to amuse or challenge the people playing it. It's designed to kick you right in the feels, show people a small smidge of what it's like to have a depressive episode, and not incidentally illustrate really viscerally how those bloody negative spirals work.
I've some professional interest in what it's trying to do, so if it failed to engage you -- would you mind trying to point out where the experience breaks down, exactly? If there's nothing specific, or the idea itself is just too repulsive, that's a valid explanation, too.
I think the "Quest" word has given you some negative preconceptions, Las.
Yeah, the title is a major /o\. My first association with "Quest" is "grindy, boring JRPG-derived junkpile." This is in many ways the exact opposite of that.