The bottom mid interior has z-fighting overlap issues. The path around bottom mid is extremely bumpy, so you should consider smoothing that out. I also recommend putting some more flat terrain at the outer edges of your map so that it doesn't "fall off" near the rock wall boundaries. Some pathways between the rocks are narrow, even for ghosts. The mantis gets stuck too. Since there are so many ghosts, you might want to try swapping some out for rocket warthogs or gungooses. I also recommend making a clearer distinction between the bases. You could do this with more color differences in the structure, lights, or nearby natural. The aesthetic of the bases is pretty good.