This is such a fun concept! I love both acquiring resources, moving via grappling hook, and moving via cannon shot, and this was a fun combination of the three!
Unfortunately it was also quite confusing - it wasn't clear which island produced which resource, and the text at the bottom was too small to read while playing the game at the same time.
Also, for the cannon shots, I think you need to add the cannon island's current velocity to the ball when you fire it, as currently the shots go off in random directions relative to you. This is made especially confusing given there's no real indication of your island's velocity relative to the world.