I don't know much or anything really on 3d but people say rigging is a lengthy process. That maybe the issue, because the Dev is making unique body types for each girl, instead of using a highly customized body that can be adjust to look different.
If they were making a Onee-shota game instead a Monster girl-shota game. They coulda just copy and pasted the body and modify the proportions abit.
That is the detriment to making an ambitious creation. I'm willing to wait since there are other games I'm also looking forward to but I do hope Dev does not lose interest on the project.