Just about two weeks ago, I discovered Adastra and started playing through it. Now I have played through it's entirety, through Interia and Khemia, and they have become my favorite VN's I have ever gone through. With that in mind I want to throw in my two cents on Khemia so far.
I am hooked on the story. It brings a lot more depth to this universe, and I really liked what someone else in the comments here said, that Khemia is a reality check on Adastra. With that in mind I think that Amicus's character seeming different here than he did in Adastra and Interia makes complete sense. In the other VN's we are seeing Amicus through the eyes of Marco, and their relationship is completely different. They are lovers and best friends who talk to each other openly. Also, whenever Amicus's arrogance would come through, Marco would be there and would bring him down to reality. On the other hand, in Khemia, Amicus doesn't have Marco by his side, and has the constant worry of his mission back on earth. On top of that, Amicus is Scipio's emperor, they are not friends, their relationship is completely formal, and Scipio fears Amicus in the sense that he is his Emperor. (There probably is a better word than "fears" that I could use but English isn't my first language. You hopefully get what I mean). All the scenes that we have of them together here in Khemia are in official settings, meetings, etc. So Scipio never sees the more informal side of Amicus.
Now onto my only problem with Khemia. The sprites, some of them at least. I should start with the fact that the CG artwork looks absolutely brilliant, and that most characters look good. The sprites for all the new characters look great, with a standout being that of Aya's, her sprites are probably my favorite in the game. Neferu was a bit weird at first but I grew to quite like his new look, and Virginia also looks great. My only gripes are with Amicus and Cassius. Starting with Cass he just looks a lot less expressive than he used to, and his eyes specifically look weird to me. And with Amicus, it just seems that with every game his sprites get a bit worse. With Interia I think he doesn't look as great as Adastra but looks decent, and I understand that his sprites better reflect his look in the CG's. So I could live with that. But with his look in Khemia I really think that he just looks wrong. His body, his face, they just look so different, his expressions are weird, his belly is gone. I just can't get used to him. He doesn't appear in that many scenes, so I guess it's good that he is not a main character that is on screen most of the time, but whenever he appears he just feels weird.
To wrap up, though I think some artwork could really be improved, and I really hope it does, the story so far is great. I have really fallen for this world, and I can't wait for more. I hope that if any devs stumble upon this comment, they understand that my criticism comes from a place of deep love for the game and the characters. According to a public post on Patreon, progress has been delayed as life has gotten in the way of some project members, I just want to wish all the best to everyone, and take all the time you need.