Yep, that's exactly right on both fronts. You see the "sidedness" in game when you're away from the galactic plane, while the sun is pretty close to it. You're correct about the color enhancement, too. It just adds a nice graphical touch to the game. I always imagine that our canopies aren't just some transparent material, but that they process the image we see.
When you traverse the Y axis, you do see the position of the brown band change. It's subtle, because the band of navigable stars isn't terribly thick at the bubble. If you go to the core it's much more dramatic, both because of how bright the core is and because you can get a few thousand light years away from the galactic plane.