According to Lonely Sock Games the closed beta is now over and necessary improvements have been made which brings them to the Coral City open beta. They encourage people to try the game and make sure you read the instructions and download the game here. Also make sure you give feedback on all bugs or improvements you come across.
About Coral City
Dive down deep into the world of Coral City and build your own underwater paradise. Experience the vast coral filled world and its colorful Merpeople inhabitants. Coral City puts you in control of Coral City’s destiny. How it will look and evolve is completely up to you!