Control s are easy: arrow keys to move the shark and 'control' to bite. If you go fast from down to up, you'll jump and by this way you'll get to further objects to bite them.
In your way through the Australian seaside, you'll find all kind of preys: small boats, swinners, yachts, helicopters and many more.
Sydney Shark is quite long and amusing. If you like 2D games, you'll have fun playing it.