Blue Custom! Make a Universe!
You should continue on with this and make plants, different species, fishing boats, changable character between the species, and beaches with coral reefs that thrive any otherspecies. You could make sea anemonies to schools of pankton. You could make entire ecosystems and the character could trive within them by being a herbivore or a omnivore or a carnivore depending on how the player wishes! This is gret start on what you did.