I'd have to respectfully disagree, so here's my interpretation. I see the space opera adventure theme & setting as a refreshing change of pace for a story that includes incest romance/sex involving the MC. Especially when compared to the majority of other incest games that's primarily set in the family's house & neighborhood, with almost each story starting off with the MC moving back home, reuniting with his female relatives after being separated of them for whatever reasons for 'X' among of years.
The main journey has been focused on MC & his ragtag space crew on a rescue mission to save his kidnapped sister Eva. Along the journey meeting people, allies old & new, some foes, researching for clues on Eva's whereabouts and just happen to get caught up in somebody else shady business. In the midst of all this we see the feelings & deeper intimate relationships slowly develop between MC and his female relatives Aven, Lilly, and Nadya. Deepening a new bond with his like-minded cousin Aven, his caring motherly aunt Nayda, and rekindling with his at first hotheaded sister Lilly. Plus MC overall slowly maturing as person on these adventures.
The intimacy and forbidden desire nature is still visible to me within the grander scheme of things happening. There's the initial concerns of being caught, before ultimately embracing each other desires and love for another, the secrecy among those near them. Even at end of Season 1 Episode 12 we see MC & Aven together in the gym and they were almost got caught. Then we have got bombshell of learning that Nadya is actually MC's mom and not his aunt, meaning Aven is MC's sister, not cousin and that MC, Aven, Eva & Lilly are a product of Nadya & MC's Dad Agust (A Main Villain going into Season 2) own former incestuous relationship. Plus we got 2 more planned seasons to flesh out this aspect of the story even more and very likely get more intimate wincest moments.
I guess it should also be mentioned again that Perverteer intended on the story/the incest romance to be more slower paced in comparison to his other visual novel game Sisterly Lust, which is more faster paced.