The Xbox.com PC Marketplace, which is where you can go to purchase Games for Windows Live titles, you non-existent person, you, is about to shut down. Microsoft has set its closure for the very near future: August 22, 2013. "We encourage you to spend your Microsoft Points balance prior to this change," writes the company. "Although you will not be able to purchase new games, you can continue to enjoy previously purchased content by downloading it through the Games for Windows Live client software as usual."
Developers have moved away from incorporating Games for Windows Live in recent times, and thank goodness for that. I'm struggling to come up with even a single example of its usage that wasn't an extra annoyance to deal with. That's sadly the best case scenario. As such, I can't say I was ever compelled to buy through Microsoft's soon-to-be-removed storefront.
Indie Statik got a humorous response from Insanely Twisted Shadow Planet's Michel Gagné, who commented that "[the game] will continue to be available on Steam. In fact, soon it will be GFWL-free. Thank God!" Pretty much.