1. SVG uses vectors, which means that it represents basically points with lines in between them. Because of this a curved line takes a substantial amount of datapoints to represent, while a straight line only takes 4 (x1,y1,x2,y2).
Therefor it might give a better look if you try to make the borders less round, with the added benefit of the lines not looking like the weird thing they do now.
2. Maybe add some more islands around the edges of the map, to make the outside bonuses harder to defend, as well as give it more possibilities for expanding around the map. (See: https://imgur.com/a/TeP5WOi
I also noticed that a couple territories overlapped with the purple outline of the map, so maybe move the outline out by a bit?