Rant time, as much as I've been enjoying part 3 so far, it's by no means perfect, but there is something I found particularly egregious and I've no idea how TRTR didn't notice it and how easy it would be to fix it.
My tip for those who haven't gone through it yet and without spoiling too much, from a purely gameplay perspective, you might want to go through Alice route first.
After you finish one of the routes, you get a similar cutscene to the one that happens if you pick the '3rd choice' for the Great Decision during the demo, in that you get the option to turn back time to either the very start of the game or pick a different choice during the decision. If you go with the latter, you'll also have the choice of who your starting heroine is. The problem is how half-baked it's implemented. Going from Ilias to Alice, you don't actually get all Alice-exclusive companions, you'll be locked out of recruiting Yao, the Roach Queen, the 3 Black Nobles and you'd have to backtrack to a random place in the Middle-Ages to recruit the twin succubi. I imagine it isn't as big of an issue going from Alice to Ilias as all of her exclusive companions are more tied to the main story and get recruited regardless, but I believe instead you miss out on the minor side-quests revolving around loli Lucifina and Micaela. To not be complete dead weight, your main heroine does gets a boost to her starting level and jobs/races... That being a base level of 60, one max level advanced job and one max level advanced race, when every random mob you've recruited for the past 8 areas should have way more than that.
Worst of all, you aren't given any context on the story differences between each route. I wouldn't blame if someone who's only gone through one route assumed Nuruko revealed her true form on Ilias's route or that Sonya turned back time to replace herself in Alice's route. You also don't get the race upgrades from the end of part 2, Nuruko becoming a fairy or Sonya becoming apoptosis. The solution seems so simple too, either make the reset happen at the end of part 2, whether before or after the events over at Ilias Temple Ruins, or have another Strategy Conference to recap what happened like they have in-between each chapter. Even if that meant you'd still miss out on the aforementioned minor-exclusive recruits or side-quests for those willing to go through the full NG+, at least you would still have knowledge of the main events for each route.