Technically, I think all of the games posted on F95 are made by amateurs...maybe less than 0.1% aren't? I don't know, making NSFW games isn't exactly the most lucrative career of all time and typically only single person developer teams can be realistically supported to do so full time (and usually not even that). Which not only leads to a developer spreading themselves very thinly as they try to make content for their games, it also means they have to know how to accomplish themselves everything that the game requires, be it conceptual planning, game design, coding, art, sound, UI, characters and writing... It's a lot of different disciplines that you have to be able to do at least competently, and it naturally leads to most NSFW games being less than perfect in every area due to the individual strengths and weaknesses of the developer making them. Like yes, I'd like to go over the whole game with a fine-toothed comb to fix textual issues (mostly just simple errors rather than any kind of greater issue like the writing at its core not being good enough*), but one, I'm not then also responsible for doing literally everything else, and two, even though I wouldn't be responsible for doing everything else, it would still take a significant investment of time and energy just to do that. I actually thought about making a mod to fix at least what I feel are the most glaring stylistic issues that bug me the most, but RenPy games seem annoying to mod (and to perform upkeep on a mod).
*At least personally, I've tried many other games and I would say that the writing style of this game appeals to me much more than the vast majority of others that I've tried... Yes, there are some issues I'd like to see worked out someday, but for me, it's like watching a less than perfect video quality version of a movie that you like (or even worse, if it were from something actually awful like a VHS recording) versus watching a pristine 8K copy of a movie that you dislike, you know? Yeah, the VHS might not look or sound great, but the movie itself is still something you fundamentally like at its core, and that matters more than anything else.