Malebolgia is out now on Steam Early Access: Store.steampowered.com
The Early Access release offers a look at a very substantial portion of the palace to explore and combat encounters with half a dozen boss and mini-boss monsters. This version is intended to gauge for feedback on pacing, difficulty and technical feedback as to hardware/performance and bug-testing in general.
The full release would of course depend on feedback and development during this Early Access period, but I would estimate the final date to be late January/early February.
Please enjoy playing the game and feel free to leave your feedback and comments in the Steam community forum.