Although it is true that they are giving a free product, you should take all the complaints that you can understand and use it as a good criticism to improve your product in the future.
For example, at least on this page many complained about literally 3 things if I remember correctly
1) the characters move really slow and at the same time the cutscenes play very slowly, even with a skip button for dialogue, the cutscene transition is painfully slow
2) The whole kidnapping arc, it's clear that not many people liked about that (especially for me, the part where they force her to eat grass wtf), it seemed like the little plot of the hospital was going pretty well and then this plot twist happens.
3) When you have to play as the husband during that same arc and have to do his janitor job, it's painfully slow
Although the second argument could be completely ignored because, after all, that is what he must like, the other two are justifiable and can be fixed by making the passing more comfortable for all those who decide to try the game
However, if the author wanted to fix the second problem, just implementing a skip button for that entire arc would be enough.
And if he stopped updating the game on other similar sites, it means the complaints might be the same.
The game also seems to have optimization problems.
take Laura lustful secret as an example, at first there were several negative comments if I remember correctly, but the author took the complaints positively and in the end only those who were really interested in the project stayed
I am not justifying the complaints that seem to only exist to create hate, but all those that seem to have their points clear can be taken in a positive way to improve.
PS: I'm still learning English, so I hope that what I explain is understood
