We're still exploring our options regarding Germany's legislative restrictions.
Steam users can enter product codes for banned games in Germany, and we'll be distributing those to backers. Also, itch.io has a feature that lets us include a Steam key with every purchase, and we have no problem enabling that for everyone. A USK rating is costly, but it may be our best option should the Kickstarter succeed. Not sure, though. Still looking into it.
Thanks for the question!