What do you mean "have to" Just don't play. And if you aren't into the characters go read a different novel or something, leaving a negative comment doesn't really encourage them to try their best and release this game. As much as I do like your idea of staying on your own, it contradicts itself as this is a romance VN so there wouldn't be any real point in playing if there were paths that lead to nothing. Not hard countering your opinion but just giving some criticism.
Don't worry I already deleted the game. I see no point in pursuing romance with irredeemably broken characters. I did however complete the creator's survey at the end of the game, hopefully it will steer the creators in a favorable way for those that do love it and bring a greater amount of followers in turn. I posted my comment before doing so unfortunately as it sometimes the only way to connect with the creators.
I'm glad that you gave them some feedback to how they could put the game out towards an audience with your similar interests but I still don't understand how the characters are irredeemable and broken, they're just characters in a VN and relatively common ones too. And I have to agree that contacting the game dev's and creators through itch isn't a bad idea, but they do have a twitter page and the dev's themselves have their own separate pages too. If you do really feel the need to reach out to them Id start with their Twitter page linked in the games description on this page.
Totally understandable, I get the no Twitter or Instagram thing as I am also a person who either doesn't check it often enough to really have the need to use it, or just don't like some of the toxicity it can cause in daily life. As well as the dating the types thing, it would be hard to play a game with the same types of characters you had dated previously but I don't think that's really the games fault for picking them as they're pretty common characteristics in these Visual Novels and are more desirable making the game have more of a hook on the people who do want those qualities.
In fact, this video game is a VN of navigation through altering the plot with choices you make, of course it has a strong component in dating and romance but it is more than just a dating simulator, right?
Also, I think it wouldn't be bad to include the no-dates route for those who are asexual or straight but liked the concept, plot, or character, and just want to make them friends, I'am not one for that but I can understand. It could be used to see what the characters do if you don't go with any of them. For example, maybe Jude and Quinn will get back together if you don't intervene to give that rabbit something better (although it's possible that Jude actually needs Quinn to not be so alone or something).