I've made it past Episode 1 on the second lowest difficulty so far. It's honestly really satisfying gradually getting more confident about navigation, movement and combat as you slowly learn, from someone who's basically completely new to first person shooters as a whole.

I think the levels are too labyrinthine overall, though (especially after watching Doom Eternal, which seemed to have a much better balance of navigation and action), and I don't like how the game relied on darkness and low light to artificially increase the difficulty.
The music is great, though, and just the overall game feel is charming enough that I want to continue.