why? We can no longer find or buy the game

On second day when Yotsuko explains about gravitation (video) it is just black screen but i can hear her voice.

Just as it said on the tin.

Like for the black screen when there are videos. (no, the fix of the pinned post doesn't work for me)

I recall a bunch of news sites said that Valve now lets anything that is not a complete troll game onto steam regardless of content. But aparantly this is a game with a 18+ patch you need to download. So my question is that if steam doesnt block the sale of 18+ games why does this game not just have the 18+ option be defult or a option in the launcher/options menu? I know this is more of a steam question but this is the first game that has a 18+ patch that i have seen for awhile so I thought it would be...