I cuaght this on Steam a little while ago, and I'm really enjoying it.
Essentially, you control a barrel-shaped helicopter, and you fight other ships using swords and hammers and maces that are attached to your ship. The rub is that instead of pressing a button to attack, you have to move your ship around with your mouse and use inertia to smash your opponents with your weapons.
The downside is that the game blindsides you with its steep learning curve. Even so, I love it. When you score a huge hit that blasts your opponent to smithereens and gives you a few seconds of bullet time... magical.
Anyway, here's a gameplay video by some guy who got really good at it: