Game settings: Continents, huge map, King difficulty, max civs, playing as Sumeria

AI: the AI is extremely dumb compared to all other civ games, never punishing me, incapable of building several wonders and of building their own empires.

Tech/civics: didn't like it that the tech tree is now 2 separate parts. Civics system from civ4 and civ5 feels much better than a cultural tech tree. Also didn't like it that the tech tree has so few techs and very rough transition of units in many cases, like pikemen evolving to AT crews, knights to tanks. Tech tree needs more techs/more connections to feel smoother, and tech pace feels extremely rushed at early eras (I used donkey carts until industrial age but didn't build a single support unit in the whole game).

Environment/graphics/style: I'm indifferent for the overall style of the game, but I do think the game lacks many feelings from civ5 that immersed me. Thre's no more different textures from continents (instead continents exist but they are pointless), no more war/peace music distinction, no more cultural linked music (civ 5 had different tracks for middle eastern/african, european, asian, american civs). I do like it that there is a day/night cycle and music evolving trhoughout the eras though.

Districts: The system seems good at first, but there are some major flaws that need to be addressed. First, the system makes island settlements unviable. Second, you can't demolish districts and replace them for anything else. If changes were made in these two fields, the distric system would feel a bit better.

Overall, I've enjoyed the game, although it felt a bit boring at times due to the overall lack of difficulty in the game. As a long time civ player, I feel like this game has a lot to accomplish if the systems are polished. I am unsure about the districts system though, because it limits your possibilities too far in my opinion. No more island maps in civ 6 because of the change and I'm not sure whether or not districts and island settlements can coexist.