I am currently playing Witchfire, a Early Access purely single player 3d Shooter with randomized elements and a touch of dark souls and extraction shooter.

You play as a Preyer, an undead anointed by the Pope to hunt Witches in a war where the Church is on the losing end. The levels themselves are static, but the placement and types of monsters, treasures and so on is randomized - they change if you level up, meaning as long as you don't do that, you can try mastering a specific stage. Dying is a lot like Dark Souls - You get one chance at a corpse run, but only your last death is recoverable. (It's nice that even in death you keep progression-related items you picked up tho)

I'm really having fun, the game has an excellent atmosphere. I read a part of their dev team are ex-Painkiller devs, and you can feel that movement & combat wise.