Totally different style than a lot of other people here. Its got a very fun and cartoony look, but at the same time has enough serious elements to keep a viewer browsing. I like it a lot. My only suggestion would be to explore some different water textures for your ocean. Your map gives a lot of impression of depth, yet the ocean seems very flat and top-down. Not sure if that is just a placeholder texture or if it is supposed to be the finished look. If it was me, I'd go with something cool and bright with some horizontal wave lines. Something to help the water match the perspective depth of the land. Also matching it in a similar color/style to your rivers would help tie it in.

Overall it looks pretty fun and interesting so far. I'm excited to see how you finish it.