Astro Matrix - description from Softdepia.com:
The object of the game is clear the cellular space with substance by means of Tetris-like figures. To erase the cellular game field use falling figures with random shape. You can control by mouse (or keyboard buttons) the movement and orientation of figures. When figure have reached a cells of the game field with substance, you can erase the area by the figure. Your task is to accumulate the maximum score and to prevent the penetration of substance up to the highest line of the game field.
Astro Matrix is a "Free to try" program. You can download and try it for an evaluation period.