Really good concept, the humor and writing (despite being overly literal due to bad translation) is its greatest strength to keep it ongoing.
Main flaws in the execution is that most of the game is close to cinetic novel approach and fairly bland op MC be able to fuck everything without much adversary and consequences. Impregnating every third girl loses its charm quick. There is barely a reward for not fucking someone, neither is there a reward for faithfullness/sticking to one girl. Decisions would have more weight if advantages and disadvantages arise (you can only fuck one of two, characters die if one favor is choosen etc.), instead, there is usually one ideal choice and the other are fairly empty.
The main love interest are in the family, but aside from Cass, none of them have much variance and agency, they hardly comply and don't change or adverse to the plot. I wanted to like the wives, but they also don't do much (maybe later), Iris seems like a Cass downgrade, despite technically being even more ruthless.
Ideally, romancing your family actually influences MCs rulership accordingly. And, aside from Cass(again), the romances don't have much variance. MC either loves Erin or he doesn't there are not variances in who is in control, Erin doesn't change her stance if MC participated in the coup etc. Iris and Aurora have technical variances of love, but as of now it barely affected the sex scenes and dialogues.
TLDR, if every love interest got worked in the story branches as detailled as Cass, the game would be outstanding.