Use your mouse to move the boat around. When a fishing spot appears, move over to it and wait for the bar to fill up. When it does, a fish will appear on screen, which means you've caught it! But watch out for the sharks - if you touch them, your game will end. You can use the down arrow key to change the colour of your boat. The amount of points you get depends on the size and type of fish.
I made all art in the game, and came up with the idea.