Crimsonworld is a new Mac OS X game available exclusively in the Mac App Store. It costs US$1.99.
Here’s how the game is described: “CrimsonWorld is an intense shooter with loads of beasts and loads of weaponry to fight them. Watch the action from an overhead perspective as you fight off teeming alien hordes on various desolate landscapes. Progressively upgrade weapons to do away with your foes more effectively, splattering blood, bones, and innards in your wake.”
Crimsonworld has 25 unique locations, 12 types of weapons and lots of monsters. A demo is available at http://www.gamepro.com .