So my impression after playing for a while is that this game may just be the most grindy h-game I have ever come across. Fun concept but getting to the late game without some sort of cheat would take a very long time, probably several months or more as I can not see myself focusing on this game over such a period of time.
After another day, I have noticed that the progression for upgrades do not make any sense. The problem is mainly the progression for things like room upgrades and return upgrades. Each upgrade offers a 1% bonus on return, and while that may be significant for competitive games where the lifespan of the game could be measured in years, it makes no sense in this one.
The h-'scenes' are more of snippets of dialog for a single picture, and while there is a great deal of heroines there is very little difference in the actual 'scenes'. Each of them are mostly repeats of the other heroines, with the exception of the whorehouse, where you have some funny dialog.
In reality my favorate part of the game is all the various options at the base and I have only really been running through 'steps' so that I can get more resource to upgrade. As for my actual play time for this game. I will make a run through and then go back to my reading most of the time. Even with that limited amount of playing of this game I can only see myself playing for another couple of days maximum. Which means a dozen or so more run throughs and attacking the elves.