Just finished my first run through GC, and here's my thoughts:

Overall: Great work! I fully expect most of my stuff to be nitpicky, it's really a great mod.

Details:
-With the new shaders the explosions are amazingly, detrimentally, bright. It feels like everything has magnesium in it or something. Dialing it back would help the eyes.
-Audio balance is kinda a mess. I'm not sure where some of the sfx come from, but on many maps you can hear a missile firing halfway across the map, space battles get deafening, but at the same time there are these lowkey sounds (like the build pad sfx) and sounds from vanilla that feel more in line.it's not an issue of my slider being cranked up, either the modded sounds need to be toned down or the vanilla needs to be cranked to that the slider means something.
-Love the location descriptions providing reasons for the buffs. Bonus points for having everything in the correct locations.
-I don't know if the UI is supposed to be transparent, but it actually looks nice.
-The ship descriptions could be more beneficial. I was completely unaware that the Dungeon ships were "mini carriers", I was thoroughly confused as to what it was going to do until the Remnant hit me.
-I love the fact that Mandalorians can send out raid parties.
-I'm very confused as to what's going on with raid fleet sizes. Mandos get 2-4 total units (pop cap), but I was keeping tabs on a New Republic fleet over Coruscant that was 22 pop cap... and a raid fleet somehow. 22 pop cap is an invasion force, that's not sneaking by orbital defences.
-Love the 3D capital ship movement. No more pivoting in place, actual turning! Adds so much to the experience.
-The tech tree page is useless, but I also have no idea if that's something that can be fixed. I kept getting surprised when I got new units, because they weren't on the tech tree page.
-I don't know why, but the pathing, especially in space, is amusingly bad. I routinely had my Aggressors making turns so wide that were just way too wide, like going 1/4 of the map out of the way, with no obstructions.
-Custom ship names half work. I am seeing them, but in one battle the Remnant had 3 Vic2's with the same name. I have 20 custom names in the txt. I don't know why it's broken, but I'd like to see more of them.
-Some of these maps just don't sit with me personally. The two types that stand out are Rattatak and Utapau. Rattatak's type you get no landing zone, so if you guessed the wrong unit to send as a scout, you're SOL. Utapau's type you're under attack the second you land (on Utapau specifically, I was in the process of unloading troops (after deploying from pause) when I was bombarded with artillery.

Keep up the good work!