Hi! I have uploaded the atlases for the human outpost backgrounds and props.
Just a technical note regarding the props atlas: even though the assets are based on a 16x16 grid, the individual elements are not perfectly snapped to it. This is an intentional design choice to break up the monotony of the walls and floors, making the environment look more dynamic. I'm concerned that the atlas might not be very useful to you with this layout, so I'd prefer to wait for your feedback before preparing the next ones.
Out of curiosity, which game engine are you using for the project?