From the developer's page: "Aqua Forest is the first commercial product to use OctaveEngine Casual, the 2D multi-physics engine designed by Prometech Software, for the development of casual games. There are two modes in the game: Puzzle mode with a water and ecology motif and Free mode in which users can create anything they wish using the game’s tools. Puzzle mode has five levels, each of which has ten stages, for a total of fifty stages. As each puzzle is solved, the tree in the background will grow gradually. In Free mode, users will experience a whole new world of drawing. Using real physics, graphics created using the game’s tools will come to life as soon as they are drawn on the touch screen."
Priced at $7.99, Aqua Forest features a physics engine known as OctaveEngine Casual, a particle system that drives the behavior of the various elements in the game. Prepare to spend a good amount of time as you tinker with various forces of nature such as wind, water and fire. A detailed review of this game will be coming up shortly.