Apparently, I'm not the only one. Another Kickstarter backer of the project posted this on JetpackHQ's forum:
As a Kickstarter backer I was thrilled to be able to back this game and really looked forward to being able to play it in December of 2012.
Here we are 8 months overdue and still nothing.
Is there a realistic update to the release date?
The developer replied the following:
I was overly ambitious with that date and since I missed it I decided to complete the mission pack idea. I'm shooting for December of this year.
There should be the first beta release of the web game in about a month.
Thanks for your support!
I've been waiting for quite a long time, so I guess I can wait a bit more.
Also, I'm waiting for Pisi Linux 1.0 to be released. Both the forum and PisiLife have been silent in that sense. Although they never mentioned a release date, I hope to hear from them soon.
Another release that has become a test of patience is MEPIS 12. The good thing with MEPIS is that there has never been a release date, so we are used to waiting (im)patiently :P
In the meantime, I'll keep using my beta releases of Pisi and MEPIS, which have been working perfectly.