I assume, as you already mentioned, it was caused by the high mouse sensitivity. And I could turn very quickly up and down.
The German terms are funny and it partly felt like it was developed by a German game dev. ^^
I was surprised by its graphics, the humor and the puzzle to build a battery. The battery was actually difficult, because it took me a lot of time to find out that I had to interact with a vehicle near by the barn. I also like that not every German was depicted as bad like Herr Blume. I think he's ein recht cooler Typ.
The name Peenemünde reminds me of the city of Swinemünde, which is now part of Poland, but still a favorite holiday place for many Germans, especially for Ossis (East Germans).