Most experts struggle to explain how this town became vacant. 6-12 players. Check out this competitive forge map that takes a theme of a harbor/island complex. This map is made for Koth and Team Slayer, respectively. Video Walk through below!
I love the Idea of an infection style map converted into slayer. My only initial concern is how the dock has only 1 entrance. I really think you should try to add another connection, maybe to the left of the bay if you are facing it from the church.
^ or if you make the dock less of a defensible power position you can make it a risk vs reward for a power weapon. As it stands now it has a sentinel beam, lots of cover and hiding spots, and a good view of the top of the (church?) tallest building, so it seems pretty powerful. Especially without a flank like Xandrith recommended