Nice job! I really dug the mysterious atmosphere with this one. I liked most of the puzzles, although the one involving the semaphore gave me a lot of trouble. I don't think I could have finished that part without a guide; I didn't even realize there was a man standing on the boat or that I needed to move the beacon in the direction of the bell sounds. It was hard to figure out what things were clickable, so I ended up just trying to click everywhere on each screen. The disks also, it wasn't obvious to me that they were supposed to go from brightest to darkest top left to bottom right, and a couple plates in the middle looked identical in color.
I feel like the mostly grayscale color scheme was probably to enhance the mood, but I think maybe a bit of variety with the color here and there would have helped identifying things that were important for the player to look at (like maybe the man's flags were colored red or something).
That angry seagull made me laugh for some reason, I think because it was happy looking but then mad when you click on it :)