Honestly, playing this was a joy. Each level has its own unique feeling, and as you said, the mix between level exploration and combat really sells the whole idea of abandoned places, especially you are done with everything the level has to offer and you just want to explore (or when you are looking for secrets), and the attention to detail here is top-notch, and I really appreciated it.
On another note, congrats on finally releasing this WAD. The whole project is massive, and I'm glad you put in the effort to make everything work as you wanted.