I'm a bit conflicted about the level design after playing through mission 2. The combat is super fun and challenging, but the 3d platforming is extremely frustrating, and way too difficult. I must have died about 20 times by falling down and was very frustrated at the end.
I completed 10/13 missions. I should be done this weekend.
'The Soul Spire' in the second Nekravol area had a very intense encounter that I had to redo many times. It's very satisfying when you solve the combat puzzle of when to use which weapons. The end of this level starts hinting at a fight against angelic beings soon.
The next area, Urdak, indeed looked angelic in a similar style as Diablo III. The combat encounters have become very intense now, I needed lots of retries, and was very satisfied when completing them. There was a very difficult jump towards the end of the level, where I needed to do two double jumps in a row and then two dashes to get the height needed. It's not clear to me why the order of jumps and dashes matter, but they do. The Khan Maykr boss fight wasn't terrible, after I learned to use lock-on rockets to damage her.
The final level, 'The Final Sin', takes place back on Earth, where none other than The Icon of Sin, the final boss of Doom II is the boss. The boss fight was a bit buggy, it crashed once and once pushed me outside the level geometry.