Another positive aspect is the use of dead space and bridges, i think its an underused map design resource.
Mid map chockes increase the value of map control and provide defenders advantage, but you need at least 2 paths spread out, otherwise its immensely turtle. There are 2 paths, but they are too close. I think SidianTheBard has some nice insight on this.
I think the expansions are way too easy to secure too, but i'll try to not be more repetitive.
I think the sky gate concept is ok, i don't see a problem with the rules (its debatable and not for me to decide tho), i just think its not well used here. Finally, i don't really see the value of narrow path, its just a bother, might as well just remove the middle island.