This game needs an age rating in Germany.

[Make]

Starting November 15, any game released on Steam will be unavailable in Germany if the store page lacks an age rating. It needs to be either USK's or Steam's built-in age rating.

You can read more about the change in here:
https://steamcommunity.com/groups/steamworks/announcements/detail/4678768276768588864

For those who live outside of Germany, you can check if a game has an age rating on a store page by opening the store page in a web browser (while not being logged into Steam) and adding the following country code at the end of the URL:

?cc=de

Since there is only two weeks left, it will be interesting and very sad at the same time to read news about the change once it actually becomes reality.