Neither jettlarue nor I ever said anything about BG colors; in fact I think they go quite well with the map
If there's anything to be improved on them, I would probably give the lower green BGC a bit more direction towards a bluish tinge than green all the way, but they're fine as it is.
The scenery looks excellent, and I like how you transformed the once-copied boulders a little
I guess colliders within the sun are all right, but if the flags spawn on the boulders on the very edge, I think you should instead put an Only-Bullets-Collide roof above them instead of giving the sun colliders. Perhaps do that, and throw in some more scenery in the bottom corners of the map, and I'd say it's ready to release