This looks real nice! I like your colors, and the blues and greens go well together. The red roofs are still a bit bright, but the only color I really don't like is the turquoise tower roofs in Ruby City, and the reason is that it's a different blue.

Blues are notoriously hard to match. Almost any green hues will look ok together, same for red/purples, but blues don't. When I need multiple shades of blue, I take the predominant one and then change only the brightness and saturation to get others. Changing the hue on a blue, even a little, will make it clash.