It's a clever top-down, multi-directional scrolling shooter. When you destroy enemy ships, they leave behind debris. You can drag these floating pieces of hull or boosters or lasers and attach them to your own ship. It won the top prize at the recent Game Developers Conference in China, so it must be good.
Also, if you register, you'll get special access to Captain Forever's sequel, Captain Successor.
Captain Forever [Farbs]