The fact that this game is on hold is certainly annoying, we have all invested a lot of time playing it with different paths so yes i can understand that some people are pissed.
Of course we have learn that the dev is sick and has to put it on hold, we just hope he will be fine soon.
But when you start a small business and sell a product and if you cannot finish it you can expect a lot of angry people.
Here most of the people complaining certainly never paid a cent so complaining is quite ridiculous.
The fact that we already have seen many devs suddently getting sick and putting their game on hold and still earning money from Patreon for a very long time, years sometimes, contibute to make people think they are all the same.
I have been a modder for many games since 20 years and i have got a lot of people complaining about updates, about bugs, requesting favors and so on. Some have even harrassed me by mail with angry rants, so i perfectly undersand the problem, it's part of the job.
People are people, finally i prefer to get harrassed or insulted because i'm late than getting ignored because nobody cares about my work!
If you are a fragile little flower, you better not create games because you surely will face a hurricane one day.