Ok, you have to be very honest it's not "bad" as it is but it's not a great game either.
1.- "Stolen" art: several games do something similar and it's not really that problematic, it can work as long as you don't use out of place scenes or different "art styles" (the younger sister looks too different from the rest).
2.- The story: while nothing new, the truth is too fast corruption (daughters become nymphomaniacs in 2 minutes literally).
I will give you the benefit of the doubt because I like the approach but I would recommend the developer to define the story well and if it is a good idea to continue using the art of other games.
I really appreciate the constructive criticism, thanks. While I won't "correct" everything you've mentioned, it's not because I haven't considered it.
A couple of counterarguments:
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Karin Base Sprite - This is the most consistency I'm willing to sacrifice for the sake of getting certain scenes and effects in the game (the other one being Asuka, but to a slightly lesser degree), and... spoiler alert for v0.2:
it is not permanent. That said, even though I'm working with mixed source art, I'm trying my best to make everything consistent, to a point I edit almost every image I use.
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The Story - The pacing will change a bit, but the game's going to remain near the border between VN and Nukige. I'm going to add game play elements, which should affect the player experience in a positive way, and the story will obviously get more complex with time. The current version is an intro.
I made some progress with v0.2, by the way. You can expect some fixes to the current content (typos mentioned in PMs - thanks for that; backgrounds for some sex scenes; the heaviest censorship will be removed - the game won't ever be fully uncensored, though), a simple money management will be added (it will be affected by the in-game choices), and players will be able to make their first decisions.
Cheers!