Current statusPurity's development is on hold. The next step is to make its duel mode a fully playable, reasonably balanced online game. To do that, I'd need a small but dedicated group of players to help test and refine it. When development resumes, I'll put out the call for testers.
Until then you can check out the IGF build, which has the four basic game modes functional and a few maps.
early demo footage
SF.net project page
IGF 2008 build
Press2011.02.16 - Free Gamer - Purity
2009.01.08 - GameSetWatch - GameSetLinks: Indie, Indie, Indie
2008.12.19 - IGN - Independent's Day Vol. 15: Mad Science