You could improve this game by adding some juicy effects. Sprites when you are hit, points floating up when you get a fish, water trail while you move. You could also add trails for rocks and incoming fish. It could be also a nice touch if the body of the swordfish was flexed when it moves, and waving the tail when it’s idle. Same for the enemies. Why I would change is the slow transition between screens, hey I want to play as fast as possible! haha