Anyway, the title The War of the Insect Gods came before we had that ending, before we knew they had become gods. That we knew the evolutionary cycle they went through. Before we even knew anything about that. We had an ending.
The transformation scene, where man is becoming insect and insect has become at least man and beyond that - a flying, godlike, shimmering, diaphanous, beautiful creature.
It's very easy to make insects move. Because they do move mechanically without the rippling of flesh as you mentioned. They move more like real tinker toys and you can make models of them quite easily.
It's an end of the world I guess. I guess you'd currently call it disaster movie. But really they weren't disaster movies. They were more end of the world movies. This is more an end of the world movie.
It began as this desire to do this science fiction movie about perhaps one of the last insects left that nobody's done anything on, which is the cockroach - and truly one of the most frightening insects.