Hello and thank you so much for trying out our game and giving such lovely feedback!
From chapter 2 enemies will continue to scale to the average level of the party so that people who want to grind in the meantime can still have a challenge.
To answer your questions:
Whilst trying to avoid spoiling anything, we'll share some of the plans we have.
Yes, we do have plans to reveal the cow girls in a future part of the story. It will reveal what happened when they got taken away.
The well will indeed have a function later on, we want to add a few secret areas with unique equipment and things like that as a way to encourage players that like to explore and discover rare things.
The plan for the lab includes trying to navigate dangerous machinery but the main theme will be encountering failed experiments or hybrid monster girls. We're working on this particular area right now for one of the first few content updates.
More will be revealed about the emperor in due time during the story, the capital will be revisited and eventually a place you can go to again. The ship there will be used to explore areas of the map that are not currently accessible and possibly new continents when we have enough content.
Without spoiling the plot, you seem to be having the correct ideas about the priestess. When you eventually go to visit the realm of the succubi in chapter 2, more will be revealed about this situation and what her interactions with the player really mean.
Hope this answers your questions!
Thanks so much for the well wishes, we hope our future additions will also be to your liking!