The one thing I’ll ask you about your story is the thing where (where = place, were = past tense of are) you mentioned He killed every human being he found. I got either lost or confused and got the idea that all Aryans did the same, although, later on you mention them as dictators, which would contradict a bit the idea of trying to erradicate all humans (if I understood correctly).
I think you’ve got a lot of great material here for more than just one chapter. Sometimes is better not to explain a lot at the beginning, just create tension, misery and let the reader know the most key of characters (that’s one advise that has served me well).
I hope this was helpful and all I have left to say is that you should keep it up and I’ll be here to read and help you in any way I can!