The map of the spheres with the markings for the floodwaters advancing is so damn cool. Definitely something I'd turn into a player-facing graphic to give them an instantly understandable and impactful sense of their timer for the adventure.
The level of detail you've gone into for the factions and NPCs is exactly what I'd look for as a GM to run this type of adventure, where I need to easily reference what characters want and what priorities they'll default to when pressed.
Your title feels like one that I would've struggled to come up with a good concept for, but you tackled that assignment extremely well.