From the non-existing box blurb:
"Bennu is an innovative physics-based puzzler. The player controls a ball and chain and progresses through the levels by swinging from place to place, all the while destroying the blocks on each level by swinging into them. Bennu features both single and cooperative gameplay.
Bennu placed in the top 20 of the 2008 DreamBuildPlay contest."
[size="3"]Download it at Once A Bird's website.