I absolutely love the artstyle and presentation of your game, it's really top-notch. Jumping into the water feels satisfying. The water itself looks really good too. I like that you can see the colors of the sky and the moon reflecting on it. It makes the game feel atmospheric.
The only bug I found was being able to swim through the island and ship and some sprites popping up on the edges.
It wasn't clear at first what was the effect of turning on and off the lamp (or if it was doing anything at all), maybe you could add a sound effect for walls disappearing and appearing again. If it wasn't for the object being unique and the popup I wouldn't have guessed I had to place the branches on the table. Other than the lack of clarity the puzzle was too easy. Maybe you could a element that would require the player to think a little?
Did you make this all by yourself or are you in a team? Anyway, great work!