Ah no worries, I'm pretty sure it works in most regions, Germany just has very particular censorship laws when it comes to violence and/or nazi imagery. I assume the former applies here.

That said, for some keys it is possible to be activated even if the store page isn't accessible. But I figured on the off-chance that your winner ends up being German I'd let you know. I haven't entered myself since I never got to see if I'd like the game or not, haha.