Move the shark and try to catch the fish and earn a point. But avoid the starfish or you will lose a point. The shark will follow your mouse or, better yet, try this with the Scratch Lab face sensing blocks to have it follow your nose! To try face sensing, download this project. Then, go to https://lab.scratch.mit.edu/face and click to try face sensing. Next, upload this project file and make the changes as indicated in the comments on the Shark and Shark Tail sprites when you see inside.
Thanks to @codifiedkid1, who is featured on the Scratch Lab Face Sensing page! She helped me test this project along with @codifiedkid2.