CGDC4: Save the Planet
Save the Planet is a projectile shooting game in which the "ball physics" theme has been implemented as gravitational force applied to spherical bodies in orbit around a planet. It's a simple idea with mesmerizing effects.
Game link: http://jayisgames.com/cgdc4/?gameID=10
Note: All comments originally posted here have been moved to the Save the Planet review page. Please use that page to post your comments and questions about the game. Thank you!