I'm glad you liked the art! I'm not much of an artist, so I was just trying to give my game a distinct visual style.
Are you able to make it onto the boat at all? I don't have a Mac, so I can't test it myself. Once you get on the boat, you can drive it from the top platform (might be a bit hard to see with the art style) with the A and D keys.
The only thing in the game that should interfere with jumping is that you can't jump from the ends of the boat. I was lazy with the jumping logic, and it was possible to jump out of the screen by jumping right next to a wall. I should have come up with a better solution for this, but I ran out of time.