Oooooo yes!! Ok so I like the worldbuilding, I think it's a really cool concept for a sci-fi, and I feel like it's a world that has a lot to explore and a lot of good thematic elements. I really like Reiji's narration. Always preferred the first person narration style for this reason, so I could understand the character more, and I think that works great for him and his personality.
I'd like to see more descriptions of the setting, I feel like it'd help the atmosphere, and help the dialogue transition better!!