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Pre-order and play the Beta right now, only on GOG.com.

UPDATE: Say your prayers: Hellmut arrives at GOG on February 26! Pre-order here and get a free exclusive weapon - the GOG Galaxificator.

Reminder: The Beta, available immediately to everyone who pre-orders, has received one hell of an update! It brings new environments, characters, and boss fights, plus several fixes and improvements.

Hellmut: The Badass from Hell is now available for pre-order, DRM-free on GOG.com with a 10% discount.
He's been to hell and back; that changed him. It still does, in fact, as Hellmut can transform himself into the Rat King, the Orc Fairy, and a bunch of other absurd oddities as he fights to eradicate any demon he comes across in this explosive dungeon crawler.

Pre-order to get the Soundtrack and Wallpapers for free (available at a later date), as well as access to the Closed Beta (available right away). The Beta will be receiving updates on a regular basis, so participants can see the game evolve and offer their feedback to the developers throughout the process.
Post edited December 08, 2017 by maladr0Id
Yeah, this game is very good and the developers are very active even on the GOG forum for any questions.
Also for once a game seems more focused on GOG than Steam, you can only support them!