First thing I will say is: Hello all. This is my first week of reviewing your projects, so bear with me. I will try to keep things on a broader scale until I can hone in on the feedback you guys are looking for. Let me know if I am stepping across any lines, as I am very very new to this.
Ch 1: It seems like the characters here are lost but they don't really have that "lost in the desert" feeling. The dialogue seems too lighthearted for what I am imagining to be a pretty dismal situation. Characters that joke when under pressure are great and all, but the situation comes off as not that big of a deal to me. I'm not really sure the best way to address this, but I feel like a few changes could really push the atmosphere in that direction. Unless, of course, that is not what you are shooting for, in which case, I'd say you fell somewhere in between.
The banter between F and A pushes A's character, which I like, but I feel that H and F come off a little on the flat side. I think that characters telling bad jokes is usually fine, but when the joke comes off as confusing (i.e. the rice) maybe it is worth cutting all together. The other jokes are fine, I think.
The woman in the desert still has me asking questions and I can't wait to get the answers to them, so kudos to you for that. Between it and the question of what will happen to A next after absorbing the light, I feel that making the second chapter a continuation of this would really push the reader into asking more of these questions, which I have always felt makes reading much more engaging.
Ch 2: This chapter shows off some of the worldbuilding (i.e. unique ecosystem and creatures) which I am really enjoying. The combat could use a little tweaking as I feel that it is a little too specific in places, which comes off a little tedious. The dialogue between D and S also could use a little work. I felt that D comes off as too much badass desert girlfriend with not enough substance.
All in all, i think that this is a pretty good start with a lot of potential. It is obvious that you have put a lot of work into the worldbuilding, which is always a massive part of any story, and it really shows in the final product. The characters could use a little more fleshing out, but two chapters is hardly enough to really judge this. A and S do come off as very similar characters, which does make since, as they are brothers, but I feel that they need to have more distinct differences. Even just little things like mannerisms can help this a long way.
And last but not least, I love the map. I am a sucker for a good map and you deliver. It is hard to really know what everything is, but that is why we read the books, isn't it? Specifically, it is hard to tell if the desert is a part of the city state, or is it its own sovereign entity?