Hey, this is kinda like Beggar of Net's game My New Life. This is a good thing! Klub17 can create some of the best and most varied models. Way better than all the static Ren'py models in other games whose faces almost look completely the same. You've got variety, so that's already points in your favor.
But yeah, for a start this game looks like it has potential. You've got full animations in here which is awesome. They're nice and lengthy too and you can skip them if you want. Already a lot of the headaches RPGmaker inspires look like they'll be completely absent. The girls look great too, my favorites being Lucy, Abbey, Andrea and Grace. Some seem a little odd and proportions are a bit off balance but very good for a 0.1 release. You can always go back and edit the models if you want.
As for nitpicks, I think that the clothes of the girls should be changed up a bit. While the outfits are hot, Grace and Annie in particular should at least have casuals or school clothes rather than what they already have. The proportions for some of the girls like Annie (her hips), and Helen and the Teacher don't really strike the same balance some other girls do. I LOVE big breasts, but I do think the rest of their body proportions should match if they've got huge bust sizes, or at least balance them out. Like in My New Life even the characters with the hugest knockers have bodies that balance them out somewhat so they don't look completely out of place.
My only real complaint is that I wish Annie, Grace and the mom were his STEP family instead of being straight incest. I'm not a huge fan of the incest genre, I find the concept of romancing a step family much hotter, but that's just me. This just a matter of preference I'll still play it regardless.
So yeah, a game with nice plump, curvy women and excellent animations. I'll be watching this to see how the models are improved and what other girls are added. I'll be comparing this to My New Life for a while (I kinda already did) but when this game starts to get some traction I hope this game's quality will equal or even surpass BoN's game. Of course, that depends on how much time and effort the creator puts into it. We'll see.
Overall good start. Just make sure you make the game YOU want to and everyone else will come to enjoy it. Again, good models, good engine, there's room for improvement, accept criticism but ignore haters and good luck with this one.