Are the building tall enough to block line of sight of sniper towers or will that also be a possible issues?

yes the building are blocking the towers. the towers are almost the same height as the wall and houses.

Also wont be me, looks like 2 moves to get to the boat. 2 moves along the shore. Then the attack move.

aa yes good point a made a smal update on the boat so on your first turn it only take one move to get to the island. but to get the the boss its going to be 4. yes. Killing the chief not a instant victory condition this is correkt