I don't know if this helps! From A Grammar of Contemporary Polish, Oscar Swan
chcieć want tends to take the Accusative with specific objects and the Genitive with vague and abstract objects:
Czego chcesz? What do you want (anyway)?
Co chcesz? What (specific thing) do you want?
You can see it in Westerplatte http://lry24.pl/wp-content/uploads/2014/09/7-2448-x-1624.jpg