Great game. Definitely one of my favorites. Will rate it 9/10 only because I know it will only get better and better. On that note, I have a few opinions to share.
1. During the traveling section at the start of chapter 2, you can interact with Altina twice only if you go to Stineford region again. It would be much appreciated if you were to add a way to interact with the harem in Feroholm region as well.
2. I really like the new skills you have added. I would appreciate unique texts when the more significant or unique skills are unlocked. Instead of giving them at specific levels, you could lock them behind specific plot points or conditions. Similar to how you have handled Hilstara's Harem Tactics or Simon's many skills during his stay in the Orgasmic Empire. Even simply having to interact in the training ground in order to unlock them would make the skills feel much more significant and give players a better sense of achievement. Some notable skills in this regard would be Incubus Assault, Holy Burst, Atmospheric Jolt, Unhand, Ambient Mana and so on. Some skills just feel like they should be achieved at character milestones and have their own moment. Such as Unite the Harem, Heroic Echo, Dark Lance, Channeled Luck, Mother's Lust, etc.
3. It would be cool if there was a way to check some of the hidden stats (Economy, Country Score, etc). I mean there are harem members who could tell you those stats or give a ledger. And it would mean optimizers like me won't need to manually keep track of them. It is very cumbersome.
Also that "over 50 hours of gameplay" is such an understatement.