mmh I disagree, If the game is broken in some form or another and you point it out that is not criticism per se, that is an objective flaw that needs to be solved, no one is gonna argue than the game is better off not working. if the game has several game breaking flaws then you can probably make criticism about the creator and their lack of polish and how it should have been properly tested or there wasn't enough QA time.
when you criticize something your personal preferences are obviously gonna take part in your view of the product, just see how divided people are over Death Stranding for example.
and lastly I would wager that it doesn't matter how hard you try you're not gonna make a small pixel sex animations as good an animated drawn piece, likewise unless Siren were to receive severe backlash and lost a ton of patreons, he really doesn't have a reason to redo the pixel scenes as actual scenes, why 'cause he already paid for pixel art. Why would you pay for pixel art to then replace it with actual art, just save the money and go straight into the drawn scenes. Sure he could do it to make us all happy but just from the way he speaks in his updates it doesn't seem like its in his plans to change pixel scenes into actual scenes. in the end that is just my take, I wish Siren would prove me wrong though.