Killer Chat Ronin and Gluttony Gods Ronin aren't the same exact characters ^^ GG takes part in around the 90's while KC is modern day so his style is different. Ronin is not supposed to look appealing in this game, his looks aren't the main point since it isn't a romance visual novel like Killer Chat. You're comparing two different genres of games with two different stories and writing as if they were one and the same just because one character is similar, this Ronin is the Original Ronin, the Canon Ronin if you will.
For the "improvement of art and writing"; the artists in Killer Chat and Gluttony Gods are different and again the themes of the two games are different, the only thing that connects the art and writing are Rose, (the writer) Munstxr (artist of some Cgs) (comparing two games with completely different writing styles and artists like they are the same makes you look like you're nitpicking, or are too young to play Gluttony Gods. One thing to mention off key is that the artist for glut did the entire UI of KC, the game you believe as superior. Funny how that works.
"So when you start the game it says that the game depicts scenes of rape and whatnot, followed by "Confirm" and "Cancel"."
It literally says "Would you like to skip these scenes?" and then shows you "Confirm" and Cancel, "Confirm" is lit up as the preferred option to people who are sensitive for these topics and would like to avoid seeing them... did you even read the pop up?
The "Cut their eyes out" route is buggy and broken with the new update, it's actively being fixed and worked on to get the bugs fixed, thus the bug report form that is linked in the itch.io page.
The option is there indicating that the run away route will be a path to choose in the future, also when you click on it there's a line "the route is not available yet" the word "yet" would imply that it would be available in the future, no?
As most of Rose's games are coming out on steam it's not very unlikely for Gluttony Gods to join them too, but at the end of the day it is up to Rose and her ability to publish Gluttony Gods on steam.