There will be a free online demo available till the end of this campaign. Though still a very early build of the game, you'll get to experience the gameplay firsthand, and try your luck at getting to the bottom of the dungeon. You can play solo or cooperatively - which changes the strategy and feel of the game, and intriguingly is said to make death a little more interesting (I guess you'll have to play the demo to find out what that actually mean!!).
For the trailer, screenshots and other information about the game, see this post.
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