The Controls in deeeep.io are relatively simple. Your animal is controlled by your mouse and swims in the direction of your cursor (joystick/drag finger wherever on mobile). Some animals can walk on islands, where they can jump by tapping/left-clicking. Also, if you tap/click while swimming or in the air, you get a speed boost if you have boost in your boost gauge. If you are a whale, cachalot, polar bear, this will activate your skill instead. If you do not have any boost, these will not happen.