I reincarnated as a shrimp with psychic powers IRSWPP

In the ocean's depth, an unexpected menace grows. An ordinary parasite wouldn't develop this fast. However, this one is an ancient human helped by a system. The system must help him become a God. 

His abilities will help him survive in a foreign world. Moreover, the parasite has an interesting power. It absorbs mana from living beings and gains their abilities. It can even transform his body. His powers are limitless if he can survive long enough. However, he's bound to a mermaid while trying to complete the system's tasks. The parasitic uses of his abilities will lead him to grow stronger.

I MUST EVOLVE TO LIVE FREELY!