We've all been here and done that
I'm a fan of their previous work, but I will say that it is getting a bit stale. Sure there isn't much diversity in gameplay since you can only do so much, but after playing through the previous titles I still think their first major success can't be beaten in terms of gameplay. Now we are on repeat which is a shame as the art is much better, but it is going to play out just like before. With the stories getting much worse with each iteration trying to justify it's reasoning.
It's stale playing the same game a third time. At first there is a charm and uniqueness, but once you've played about 10 minutes all you are waiting for are choice A or B and sex scene. Previously we've cowboyed up and had a humorous space adventure and the writing really carried the game. The second lacked story but made up in art. GT? Makes very little sense with how the premise is set up and how you manage to pursue them. I get that you might be trying a little bit to break the mold, but it's such an odd way to prefix your story. People don't act like this to where Hub sketches seem realistic. Which leads on to the next point.
I don't understand why you wouldn't go full out guro/BDSM and abuse and leave out the options for nymphomania and lovey dovey. It seems as a weird premise with how you try to pursue her by promising her pain, yet you can treat her lovingly in a very passionate fashion. I get this will learn towards more BDSM, but like I said it's poorly implemented and there for the casual fans so you can have a wider audience. Moana's story can be swapped out with any culture and it would be the same story because they cater to the widest audience. CoCo, on the other hand culture is integral not to the plot, but the setting, characters, etc. it's all built upon their culture. Just like your Opus Magnum slavery is integral to everything within the game. This game could be swapped out with any character, setting, culture, race, etc. and it would not change a thing.
(this is more opinion to fix rather than a critique. I'm not a writer nor I am saying this is the best way to go) If you are going the abusive route make it where she has no where to go and will die on the streets in a depression era slums and that you are the only person who cares for her being. Even though you are an abusive asshole. This is probably the best way to continue the story as realistically why women stay in abusive relationship is because they have nowhere to go and think that abusive partner really loves them they just need to be better, etc. Meanwhile if you still want to leave it up to have a lovely and passionate route you can mend your ways and treat them better as a person. I just think it's a little odd how it's set up.)
Sure this game can have great art and sex scenes. If I came just to fap to something I'd go to R34 or look up some lewd pictures or GIFs. Even the arts section of this website. We are rating this as "a game" because it's under the "game" tag. The Howdy space adventure didn't have the best art, but no one cares graphic wise if it's compelling to play or read to. Like how One Punch had terrible art, but the story carried it to where it is now. Sure it's in the 0.1 phase pretty much, but if you played the other two you pretty much know what's going to happen which is a shame. I'll just hit "unlock all" and see all the scenes and dip out after I had my fun. At least you give us that and not force us to hold right click. However, I would like to be proven wrong and see this game be altered for the better as it is still early in development. Will that happen with an overhaul to the story, setting, and gameplay? I doubt it will. As the person has found a formula of success and a decent fanbase that will carry them on regardless of how well it is. I'm hoping that here are more story elements in the game and that you are given more options to interact. Once the game has been completed I'll do another review of it.