This was good, the impregnation angle is nice, and I'm glad that the whole obeying the sister thing has run its course. It's a bit of a shame the MC never gets to actually go revisit the guardians, I feel that's kinda wasted the character development you get with them to just suddenly be like 'Done, next'. Especially hope she'll get to have fun with them once they're all sporting baby bumps for more than just some sort of epilogue - though I will admit not sure how that'll work out timewise unless her super sperm makes for shorter pregnancies.
I am feeling what is basically a total lack of choices though. Sometimes you might pick between a scene with the mother or daughter but there's been nothing that shapes the path the MC takes, or the sort of relationships she has, or anything of the sort - it's essentially a linear kinetic novel kinda things. I especially didn't want to use the de-hornying potion on the family (even though I suspect it won't have much effect). Also wouldn't have minded forcibly breeding the shapeshifter even if she was upset by it.
The puzzles have improved in chapter 3, in earlier ones sometimes the wrong piece would be grabbed or rotated, now they're squarer it works better. However, they're still not actually square. I think either there needs to be a bit of a fixed border or something to allow for the middles pieces to be truly square, or, have the pieces do 180 degree rotations so they're always 1 of the actual possible positions.
Oh it has the classic thing in futa games of weirdly big penises, but I was glad that at least they didn't all have weird inflated bodies and massive tits like you sometimes get. I didn't like the nipple change (or that she got an even bigger dick). I really like the sister in general and want to see her getting knocked up even if the MC won't get any power from it.
Small thing as the fights are very simple and I don't think supposed to actually be anything tactical but... fireball is pointless... deals 7-12 damage, hurts MC for 8... so a differential of -1 to 4... light attack 6-8, heavy 5-11, making either just straight up better even if they roll their lowest damage and fireball rolls its highest. Only time I could see it being used is if you absolutely needed 12 damage (and you'd have to get lucky) to kill an enemy before they did some kind of mega attack and the upper limit of 11 on heavy attack wouldn't do it.
(values from the shapeshifter fight)