The King Arthur's Gold website now offers beta access to this 2D co-op wargame from Transhuman Directive, the indie developer of Soldat. This is paid access carrying a USD $9.99 pricetag, as they say the game is following the "Minecraft model" which includes a paid beta, and if possible, making enough cash to buy a small country (or in the case of this game, Camelot). A "beta mini-trailer" offers a look at multiplayer play from some private sessions, and here's a brief history of the project:

King Arthur's Gold was started in 2011 by Michał Marcinkowski. Completely self-funded, self-coded, self-marketed and literally made in a bedroom. Later joined by pixel artist and co-designer Max Cahill and musician David Pencil (of PennyArcade). Initially released undercover, the game's alpha version popularity kicked off because of its innovative multiplayer game design and features - mentioned on PCGamer, Kotaku, Rock Paper Shotgun and winning several indie game awards (including Best Game of the Year). After that it got a bit quiet because the developers hid in their dungeons to totally repaint graphics and recode the engine to use scripts (and boost the modding community). Following the Minecraft model it is now a new game (with the former alpha being called KAG classic) released as KAG Beta in mid-2013.