This game has been Greenlit by the Community!

The community has shown their interest in this game. Valve has reached out to this developer to start moving things toward release on Steam.

Terrorhedron 3D Co-op Tower Defense
Terrorhedron currently in the Indiefort Bundle! 4 Indie games for $4
December 10, 2012 - Deltars

http://www.gamersgate.co.uk/indiefort-bundle

$4 (cheaper if you bought previous bundles)

Included:

Terrorhedron 3D Co-op Tower Defense
Bridge It
Eryi's Action
Alien Hallway

Until 14th December