You got some good intentions here.
The game is interesting and could definitely become something great. But as you stated you are missing a lot of features. You still managed to get the eerie feeling and setting of the game. You just need the rest now.
I would suggest that the movement on the boat also were made gridbased walking. Or if you make this into a nother game drop the grid entirely.
There is a bit annoying moving so slow with the boat and suddenly souls pop up which you have to go fight off with the machinegun. If this process was a bit faster it might work, but now it takes so much time just moving in between.
The interact colliders are very small and hard to aim at so you want to interact but misses the target which makes changing what you interact with a mess.
Keep at it and you will have something great!