If you are interested in attempting to punish yourself with this title they still have a web site and it looks like you can go there still buy it. On September 25th 2015 their Facebook page posted this.
As of September 26th, the back-end system for Nether, MBER, will no longer be available to support the game. This unfortunately means that the servers will shut down on that day, and play will no longer be possible. We hope to find a solution to this and other issues with the game ASAP. Please stay tuned for updates when available, and thank you for playing Nether.
Nether on Twitter
Logically I asked for a refund since the game was never finished. It never got out of early access and therefore was never "released." Steam however says no because it was more than two weeks since my purchase. Well I purchased this in June 2014 before the developer disappeared so we all had the hope the game would become something. I would wager that they gave no refunds to anyone that purchased this title.
Seems if a game is pulled from Steam, especially if the devs disappear then everyone who purchased it should get the option for a refund.