I'll be demo'ing a new version of Neon Jack at the Game Developer's Conference (GDC) in a week and a half. Currently, the best place for new info is the Facebook page: https://www.facebook.com/NeonJackGame
You can get an old build of the game off my website (http://www.shinyfish.com/neonjack/), but frankly it's a bit crap. I'd wait for the GDC build.