Yeah, that Killua and Gon part is just....damn. Seeing Gon having to come to terms with his weakness and how he desperately pleaded with Knuckle to save Kite, along with the crying after that. Killua's was probably even more devastating because it's so rare, along with him steeling himself to leave Gon after these 30 days.
The DBZ comparison is pretty apt and it's intentional. The King is very clearly based on some of the villains of that particular series. And, oh boy, that scene with the little girl. It's just so matter of fact, it was literally nothing to the four of them to kill these people. For some reason, Youpi crouched down eating the parents has always stuck with me.
Let's not forget the Soldier ants leaving the nest to spread their seed and Colt surrendering to the Hunters.