From developer's website:
An Underwater Fantasy World to Explore
A massive ocean world, teeming with life and filled with ancient secrets. Join Naija, a lone underwater dweller in search of her family, as she explores the depths of Aquaria. She'll travel from hidden caves, shrouded in darkness, to beautiful, sunlit oases, all lovingly handcrafted by its two creators.
Naija's story, narrated fully with voice overs, will become yours, as you join her on this magnificent adventure.
Magic and Combat at a Mouse-Click
Naija has the gift of the Verse. By singing songs, she can weave this force to change the waters around her. With each song Naija learns comes new abilities. With powerful songs, Naija is able to change form, giving players many options as to how to play the game.
And with Aquaria's intuitive mouse-only control system, it's as easy to make Naija swim gracefully through the waters as it is to have her sing, cast spells, and engage in combat with the numerous dangerous creatures that inhabit Aquaria's waters.
The Xbox 360 controller and FPS style mouse / keyboard controls are also supported.
Create Your Own Worlds
The full version of Aquaria includes the level editor and modding tools which we used to develop the game. Easy to pick up and learn, you'll be able to make your own worlds, and even add your own graphics and music. The powerful Aquaria level editor allows you to test your creations while you play the game!