Another frustrated backer here.
It's completely unacceptable of Pixelscopic to leave us in the dark like this. I know there was an art stream on the 9th of December, so it doesn't look completely dead.
If any member of the Delver's Drop team reads this. I implore you to start giving us regular monthly updates about your progress. Even if it's just very minor things. We need to know how far along you are and what is yet to be done. It's the least you can do after we've given you our money and since you're still under active development.
I suggest you create an official blog, where you post updates with images, vids and other game info. And to soothe frustrated backers, send out a Kickstarter update explaining that from now on, all future updates can be found on your blog. That would be the way to right this wrong and to keep the flame alive for your game.