the title-card had me going "every chick in this game looks like they could be clones of each other" but then i saw only 1 character in the samples...are those just outfits?
tits are all the same size, faces all look the same, no obvious difference in height...just different hair and clothes.
havent played the game yet, but i would disagree with you on that claim:
while there may be a semblance between the left one and and the chick in the middle (perhaps they are sisters?) they still feature different eye colours, slightly different boob sizes and a different mouth-/ lip-shape.
your statement falls obviously flat if you compare the right one to the one in the middle, we have without a doubt different boob sizes here, and also of course different faces.
there is indeed again some resemblance between the right and the left one, like between mother and daughter, but they are distinctive enough.
they all share a similar nose, eyebrow and chin shape, so your claim is not completely without substance, they are, however, in no way anything like clones or even twins.
so if the dev decided to introduce them as mother (right) and sisters (left and middle), i would consider them a fairly well designed family; contrary to a lot of other games with so wildy dissimilar daughters, that we have to assume they were sired by different biological fathers, just to tickle the fancy of having a diversified cast.
if you are looking for a real offender of a cast looking too similar i would point you to "University of Problems", because
those girls look like if they came straight out of the same test tube.