WASD to move.
You collect shiny stuff for points.
If you touch a crab or an oyster while closing your helmet takes damage
If your helmet breaks of you run out of oxygen, you die.
Pressing down goes into dive mode:
-If you hit an animal you "eat" it and it refills oxigen.
-If you don't hit any animal and hit a platform it also damages your helmet.
Hope it helps!