Fun little game! I really liked the art and the sounds. You also added a lot of juice making it really satisfying to play. It was fun jumping from island to island and tossing bombs at the pirates.
One suggestion may be to allow the player to control their jump distance. If not that maybe add a little more friction when the player jumps, it makes low angle jumps a little awkward.
Overall great game, I had a lot of fun playing it. Keep up the great work!