What a cool & unique concept for a game, I love the idea of being the guiding light for ships to pass safely. The visuals are really nice (I like how you rendered the water and especially the water being lit by the lighthouse) and the music swelling when there's a disaster really sells the panic you're instilling onto the player.
I kinda wish the pathfinding was a bit more predictable at times, often I would light a handful of ships and they would absolutely crash into eachother regardless of how much time they had to react. I'm not sure if this exists already, but I feel like each ship should keep some kind of memory of each ship that was recently lit that way you can manage the more chaotic scenarios a bit longer.
I also had no clue what to do with the black-sail ships, haha.
Regardless this earned some high ratings IMO, great job!