This is a great game! There's some good detail and input feedback. You chose some good assets, and you implemented them well. I noticed the cannon was hard to aim; maybe you could give the players an indicator of where they're shooting? Or, since the cannonballs roll down the hill, maybe you could make them destroy any crab in its path? Maybe you could make the cannon rotate faster? Either way, this game is pretty arcade-worthy. Great work!