This game started in 2017 as a BB clone and was already reworked once to move it to Unity. That broke saves and content was lost for a time, including the relationships of the housemates, ie: no incest. Then it moved along for a bit but became much harder to patch the incest content back in as the way Unity stores the data files meant it was difficult to find and replace what was needed, and there was no support from the developer for it.
Looking at the changelog, besides needing a new game start, it says there is a system in place to make translations, which should in theory make patching in the incest content easier. But the changelog also worries me as on the patreon site it refers to the MCs cousins, which I think are still off limits due to incest.