Stained is a side-scrolling, platforming and combat action game by a indie developer RealAxis software, coming in september 2012. In stained you get to fight with creatures made up of glass and crystals.
Grab the demo : [URL="http://www.stained-thegame.com/public-demo"]http://www.stained-thegame.com/public-demo[/URL]
Stained was developed entirely using open-source software. Modelling and level design was done in Blender, the graphics are powered by OGRE, and the Bullet drives the physics engine.
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Or pre-order from impulse