This is Perish. It's being made by one man -- Aussie Anthony Richard -- and is described as "a procedural Action-RPG / roguelike-like. Dark Souls meets Spelunky".
Seeking to carry on with Dark Souls' "deadly and deliberate" combat, Perish has permadeath and a damn tasty art style. Being built in Unity, it's due out later this year on PC, Mac and Linux.
It's looking for funding on Indiegogo.