We've seen bundle offers for downloadable games before but this special promotion is a little different. Two separate indie game developers, Wolfire Games and Unknown Worlds, are teaming up to offer a pre-order bundle of their upcoming games, the "ninja rabbit" title Overgrowth (Wolfire) and the FPS-RTS hybrid Natural Selection 2 (Unknown Worlds).

For a limited time you can pre-order both games for a total of $39.99, compared to the $70 you would pay if you paid for each game seperately. Both games also offer early alpha access. If you have already pre-ordered one of the games you automatically get the other for free. All in all it's a pretty nice deal. You can check out a YouTube video promoting the bundle deal after the jump.