Use the left and right arrow keys to move (you can hold them down). Don't touch any of the obstacles. The darker blue rectangles are what you are trying to get to and they will teleport you to the next section. Try to get the lowest time possible. IF YOU FINISH IT YOU WILL GET A CODE THAT YOU CAN USE FOR MONEY ON MY OTHER GAME (called fish tank)
If the fish is moving very slowly try refreshing the page or trying again later.