Much time since my last continent-by-continent analysis, so here I go.
Name, countries, border countries, neighbour countries, suggested bonus
Slovenia, 5, 2, 3 ... 3 is ok.
Croatia, 10, 6, 8 ... bonus of 7 at minimum, almost unholdable. I personally would put 8. Probably Slovenia will be like an Oceania.
Bosnia, 5, 4, 6 (and Im not considering Javor is connected to Sarajevo; if so, make it clear). Very difficult to a small continent. Will probably be an wasted continent anyway, but could I suggest you add mountains between Herceg and Vrbas? One less border, bonus of 3 is ok, but maybe 4 because its really difficult to hold.
Srpska, 7, 5, 6 ... again, many borders. You should remove at least one. You can remove the bridge to Semberia, or add mountains between Tuzla and Sarajevo (you can open a passage between Sarajevo and Sutieska, if you want), or maybe both. Bonus of 5, since its an Europe almost
Serbia, 12, 5, 6 ... bonus of 7.
Its difficult having problems with those small continents. They are ok, but I believe you should remove the one-way arrow (these things suck, and I dont know one person that likes them) and reduce Macedonia bonus to 1.
Really, we will need better bridges

And I want to suggest more bridges in Serbia. See how difficult is go from Srem to Podrinje, for example.
But Im really worried about some big names (like West herzegovina), and even more about some tiny countries. Where will you put the number of armies to those Srpska countries? Maybe you will need change some borders, adding some land from Tuzla to Posavina, for example.
But I believe this will be a good map.
