I like that there are three bosses just in the first episode. Even though the second boss is just a pair of regular cultist enemies that got enlarged. Entire Prodeus had just a single boss in it.
One of my complaints is that weapons are hard to distinguish from each other. Mortar looks just like Riveter, local version of the Rocket Launcher.
Enemies that are invisible until shot, but that leave blood trails are quite fun. Also, the mechanic of breaking your flashlight a couple of times during the game, and spending time in darkness is interesting for a Quake-like.
Other suprises: powerup that lets you climb walls, like in Alien vs Predator games. It’s awkward, but still interesting.
While the first episode was more Blood/Redneck Rampage in terms of level design, the second episode has more of a industrial Quake or even Quake 2 feel. Which I like slightly less.