I had a little trouble understanding how the game worked, but I'm amused by the story concept! Other than arrow keys I don't know if there are any other controls, but I ended up sailing across a sea for a really long while and reaching something at the edge, but I couldn't seem to be able to get off the ship or do anything else. Here's some other notes:
- I see the start menu requires clicking on the button to begin, that violates GBJAM's control rules
- There's no scaling, so the window is very tiny on my monitor and hard to see
- There doesn't appear to be any gravity or collisions, so things like the boat can travel through the sky or out of bounds
I hope you get to expand on this idea and work on it more!