Hello! Is this game content complete?
This is a difficult question for me to answer.
The simple answer is no, I guess? There are 6 complete routes. But there are three additional routes that will be added to the game as updates (you can think of them as game expansions.) These LIs are not necessary to get a "complete" experience as they were not originally going to be in the game at all (they were added as Kickstarter stretch goals).
The amount of content in the game, in my opinion, offers a complete experience. But technically there are three additional expansions that are planned.