Was reading through it again myself just now (you know how it is, "what's this? this sounds familiar?" after a year or two) and am appreciating that the author seems to have applied the trashiness to the original game itself.
Several of the bits of lore mentioned should've been giving an 'are we the baddies?' to players, like with the wyverns, though that may have gone over some of their (the devs) target audience's heads.
Even in the original game the 'bandits violating and shipping the villainess to the enemy country' bit that causes her to wipe out the capital, was on the prince's orders too. Amy may be much closer to the original heroine than the dating sim tried to paint the latter as.
Just thought that was a nice touch to the background.