The Evolution

In a never ending blue, it appeared. A tiny creature, swimming around the blueness. This was a little aquatic creature, with gills. Slowly it swam around, in search of food. This micro creature had absolutely no development.
Suddenly it's target was identified. A jellyfish lazily floating in the water. Not moving at all. This was the perfect Food, unguarded. The fish Swam with all its might and bit the jellyfish hard. The jellyfish reacted with lightening speed. Giving the fish a sting it retreated slightly, but couldn't risk losing it's lunch.
Again the fish gained speed up, then rammed the jellyfish jerking its teeth into the fish. After taking the body as its reward the aquatic thing rested in a near by cave. Little green slime things floated around, not interested in the fish as he rested.
Later the fish awoke, to his surprise he had started mutating. He had grown a tiny dorsal fin, and much stronger teeth. He became hungry and these puny green things looked quite appetising. He quickly attempted devouring the green slimes, but was taken by surprise as the slimes morphed into smaller ones and outnumbered him. With his stronger teeth he easily tore through the smaller slimes. He finished eating the little slimes.
Something then caught his eye. A shiny little rock. He swam over to it. Mesmerized by the amazing rock was floating above the ground, unlike a normal rock. He swam over to it, half expecting it to attack him.
He smelt it. Somehow it was completely empty, but he wanted it. Uncontrollable, he moved toward it. He tried to bite it, then shortly after he swallowed it.
In a flurry of movement and colour, he became blinded and couldn't see anything but the colour. In rage he propelled forward and smashed into the wall.
After awaking awhile later, he felt quite different. Smooth like a jellyfish, all of his fins had vanished. He swam by moving his body back and forth, by slithering. The fish had become thinner and longer, he was now an eel.
He raced around with amazing speed. Relieved at how easy it was to move, he easily devoured many jellyfish. Even though he ate the slimes earlier he could eat as much as possible and still be hungry.
Suddenly the flurry of light assaulted him. Blinded by the light against he crashed into a rock and was knocked out again. When he awoke he was back to normal, his speed was gone and he once again had a teeny fish body with a dorsal fin and two pectoral fins on each side. Although this time his undersized tail, that looked cut, had become bigger, like a long fan.
He swam along moving farther and farther away from where he started out. He then came along a strange area. This place had no mountainous rocks surrounding him. Except the rocks on the ground were raised in places with deep holes in the middle.
Ignoring that and moving along enjoying the large open area he noticed something. Groups of up to 5 fish were swimming around all over the place. It was at this time he noticed a hungry growing on him. He swam forward thinking about how one of these fish would taste.
The split second he became close enough to bite the fish instantly disappeared. He spent a long time chasing them around until he caught one and quickly ate it. The strange colours reappeared but he ignored them and kept eating the fish.
After the light had finished a long tentacle had grown from his head barely above his eyes. A large bright light was on the end. A large wall of volcanic bubbles had now walled him in but he hadn't noticed because of the tentacle light. Although he thought the light was a huge annoyance and not helpful at all something changed his mind. The tiny quick fish he struggled to catch earlier were attracted to this light. Using it to his advantage he devoured many of them.
Even though he was enjoying the fish he noticed the wall of bubbles disappeared. Along with all the fish. Quickly searching for a larger predator he noticed there wasn't one around. Then suddenly huge rocks erupted from the ground pelting him full force. He became injured and started to try and escape but was blinded by multiple rocks.
After being pelted and almost fatally injured he barely escaped. Although the pain was excruciating, the fish became hungry once again. Slowly swimming he swam upon a cave. Quickly swimming inside for cover he found out that it was bright inside. The growing aquatic creature moved under a rock hidden from the outside and rested.
Waking up not too long later he was still slightly bleeding from the cuts and bruises. Although hunger was destroying him. And after giving in he wiggled and swam out from under the rock. He then swam deeper into the cave hoping to find so of the same green slime he had found when he started off swimming.
Instead of finding the slimes, he found a shark. The injuries weren't serious enough to stop him from fighting and the bleeding stopped when he was swimming. This shark was blocking an escape from this wretched cave, as well as finding food.
The shark lunged at full speed toward him, he barely moved out in time. But the shark's speed made the water push him around quite a bit. This shark was larger than him.
Even though the shark had size and power this shark must have caught food easy with the charge because he crashed into the wall and went into a daze. The fish then used swam as fast as he could and then bite the shark with all his might and killed it, then ate all he could.
The aquatic behemoth swam out of the cave and something he had never seen before in his life, and it amazed him. Rocks above the water. He swam forward and tried to swim onto the land but couldn't breath and gasped for air. He quickly swam back into the water.
Becoming outraged he swam back then forward and pounced out of the water and landed.
In yet another explosion of colours he was changing. But before he was able to change he passed out because he had too little water.
When he awoke he started moving in search of food. Only then did he realize that he was on land and he had survived. He now looked very different. He had become a shrimp slime thing. He imagined felt much like the slimes. Although he had pointed fins that were flat on the ground. His tail was still there although it changed. It was now a point with little "tail" on it. His teeth also became weaker and less pointed.
He proceeded forward in search of food. finding a larger rock that went higher, he climbed it.
On the top he found another shiny rock. Even here it was floating. Feeling excited at what form he may assume he raced over and ate it. Feeling absolutely no difference he became disappointed and slowly moved forward in search of food.

Temporary will add more.