I bought Survivors of Ragnarok, what must be over a year ago now. It doesn't get updated often, but it does get updated, some just take a long time as its a small group of devs. There was a long break when they were updating the crafting side, and the there was no words at all from devs, and people bought it around then and got angry. Personally I think its too cheap to ask for a refund, they give 66% off because its an alpha, and it is an true alpha, lots of features missing, or not working.
Its an odd game in that the controls are not very intuitive and there isn't a lot of help out there for it, but they are making changes for that and its getting there. I say get it, I don't regret it at all, I think it will be a great game when its over.
Heres the updates log for desurea, so you can see how often its updated
Oct 4 2012, 4:39pm - VERSION: 23
Aug 16 2012, 7:42pm - VERSION: 21
Jul 19 2012, 6:58pm - VERSION: 20
Jun 18 2012, 5:25am - VERSION: 19.1
May 29 2012, 7:19pm - VERSION: 18
May 10 2012, 9:19am - VERSION: 17
Mar 7 2012, 6:32pm - VERSION: 16
Feb 7 2012, 5:03pm - VERSION: 0.1.15.1
Jan 9 2012, 9:44pm - VERSION: 14