For the most part, the coloring of the countries is pretty good (I particularly like your choice for ANZAC). The only ones I don’t like are the French/Dutch territories. Maybe lower the saturation a bit on both?
Purple for China is fine, but a light lime-ish green would look nicer IMO. Something like #33ff33 [RGB = 51, 255, 51] maybe?
My only other suggestion is (if possible) move where the Shipyards/Airbase icons are put. Rather than having them directly on the territory, offset them so they’re on the coastline – Partially on the territory, partially on the sea zone.
Not only would this make them easier to find/distinguish and look sharper IMO, it would also solve the problem of not being able to see the actual territories of certain islands like Guam and Wake when they have an Airbase/Naval base on them.
But with the fact that the engine sees them as a unit, and changes their location based on how many units are in the territory, I’m not sure if you could do that with the present coding.
Overall, very solid work. Looking forward to being able to play this once finished. =]