there are a lot of actual games that use koikatsu models but have unique and custom made animations meaning that devs put real effort. Here you have nothing more than pre-recorded base sex animations from vanilla koikatsu.
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A work of filters, camera, resolution and lining is what makes you think these projects have something unique regarding animation. They dont, every fucking artist have different style about camera, about what movement is more natural or fitting the character or the scene (if they put any thought into this btw). Animation and models are well enough, and the most part here is the plot and "sub"quests.
Not to mention that im pretty sure you only played a few minutes, 1h at best, when 1st act is what was made YEARS ago, when dev had no experience to begin with. We dont live on ng+ to make things best way possible from the start, be thankfull you dont even have to pay for high and not really qualified projects on koikatsu, you didnt do shit to talk shit about something that was developed by a few if not 1 person for years, not to mention they paid for it for you to have it for free, both devs buying Koikatsu and patrons for making enough support to get new content for everyone
And as a final touch, HOW DO YOU EXPECT UNIQUENESS IN SEX, THEY LIKE WHAT, HAVE TO INVENT A NEW SEX FOR YOU OR SOM??? If you play h-games everyday seeing the same sex-scenes that foesnt make games less unique, it makes you overexperienced to the point you stop enjoing, thats all.