Hello, thanks for the comments!
You address a lot of good points. The creepy atmosphere and music will definitely still be a top priority (and hopefully scarier than the original).
I agree on your points about classes and difficulty. I plan to balance the classes a bit better this time by possibly adding some more unique elements or abilities to them so that they each have some way of dealing with or working around problems as they are encountered. The classes in CTHON could have started with more different traits from each other but they ended up fairly bare-bones, mostly due to time.
Difficulty will definitely be reworked as well. In particular easy was on the whole too difficult, which I plan to address. And yeah, I think it could be good to have both an enemy and secret counter accessible during the level, much like Quake.
Thanks again!