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.

Retrobooster
First Trailer for Retrobooster
November 7, 2012 - Really Slick

Up until now there have been some demo videos for weapons and particles and stuff. Now Retrobooster has its first proper trailer, which includes some of the in-game music.

http://www.reallyslick.com/blog/2012/11/first-trailer-for-retrobooster