The Badges symbols the country were the Prisoners from.For example Lida wears a Ost badge meaning she is a Obstarbeiter meaning work from the east.They are meaning that they are slave labor and are inferior to the Nazi beliefs.Also there is like a ranking system like if your a German soldier or policeman you get the best food and the same treatment as a regular citizen.However we do know that Juli a Hungarian gets better food than Lida but she still forcefully work with the Germans I guess its that Germany in ww2 is allied with Hungry so that why.
Lida the main character loves her family so much that she will remind us that she will save her sister.Her friends reminded as her brothers and sister.Some side characters also have family backstory like Luka saying that his Dad is in Siberia and his mom is in a German Slave camp.
Of course in ww2 there is Good vs Evil cause the Germans are exterming "inferior" races or make them as slaves.We see Lida and her friends aidding the Allies by dumping dirts into the bombs so it could explode into the Germans instead of the allies.
All of the characters want freedom from the German Oppression make sense because they are treated less than human,become and get terrible food free labor for the Germans and the Companies associate with the Nazis.