The title was described as a mix of Shadow of the Colossus and Dark Souls (more the later than the former). While you won't be climbing giant-ass monsters in search for glowing weak points, you will be fighting more bosses than traditional grunt enemies.
Gameplay is largely Dark Souls-based - with similar lock-on mechanics, dodging animations, and stamina management as in From Software's infamous franchise.
Unlike most games, Sinner starts you off with a lot of health, stamina, and abilities. The catch here is that in order to explore the game's world and actually play it, you have to give up some of your boons. This could range from a chunk of your health or stamina, to abilities and equipment which give you a fighting edge over enemies. There aren't any rewards for beating the bosses either, hence the "sacrifice" in the game's title.
From what I could tell, the story is pretty straightforward and a lot like Shadow of the Colossus. As protagonist Adam, you journey through different sections of your tortured soul and come to violent terms with your past transgressions. The bosses are largely inspired by the seven deadly sins, so expect to fight a fat Gluttony and a sexy version of Lust (just like in Fullmetal Alchemist, only uglier). There are multiple endings as well, which make themselves known through the order you defeat the game's different levels.
Sinner: Sacrifice for Redemption is set for release on the PlayStation 4, Xbox One, and PC sometime in the first quarter of 2018.