The makers of the wonderful Sentinel tower defense series have released a preview video of Bio Sub.  We’ve posted info on the game below.  Probably not going to be as enthralling as their TD games, but does put a nice twist on the ball-matching puzzle genre. Submitted to Apple on September 16, expect a release in the next few weeks.

The game:

Clean the seas in Bio Sub, a tilt or touch physics based puzzle game with a lush aquatic theme.

Unstable canisters of chemical waste are adrift deep within the ocean. As captain of the Bio Sub, your mission is to neutralize these ecological hazards and harvest the energy that they contain. You’ll need a steady hand and sharp reflexes to guide your submarine past the dangers lurking in the depths…

Steer the Bio Sub by tilting your device, or with optional touch controls. Neutralize canisters by bumping like against like, but be careful with chemical reactions -- they can both help and hinder. Work quickly or the canisters will blow, and your subs shields aren’t invulnerable…

• Descend through 70 fiendishly challenging timed levels

• Smooth, realistic physics govern game play

• Gorgeously rendered underwater graphics

• Intuitive tilt controls, with an alternate touch control option

• Online achievements and high scores using OpenFeint

Ipod Music Library access (for OS3.0+ users only)