We find his lack of rocket launcher faith disturbing
Loving this thing. Some things:
I actually liked the old plasma rifle sprite you had in the previous version, but I like the newest one too. The current one is big and heavy looking, while the older sprite you had seems like a smaller, lighter variant of the full-sized version. The older plasma rifle sprite could also be a laser-rifle, I suppose. Or a railgun.
The low-quality blood sprites for the walls and high-quality ones on the floor and ceiling have already been mentioned. The blood on the walls look like it was spray-painted. The blood on the floors and ceilings looks flawless, though.
The fatalities could use 8 viewing angles. They would be really amazing, then. I'm fully aware it would take a lot of work. But I think it would pay off well. It would also be cool if the fatality camera would automatically find a location where its view was not obstructed by level geometry. I thought perhaps if the level geometry was too intrusive then the camera would place itself automatically, but if you had a lot of room, the player could control the camera's orbit the way it is set up now. I'm not saying it would be easy to code, just what I think would really be ideal.
I note that the fatality mode grants the player health while the smash mode does not. The only reason, then, to not use the fatality mode would be so that you don't take damage from nearby enemies right after the fatality is finished (as you are immune to damage during the execution, but not immediately after), and that you can smash opponents a lot faster in smash mode.
There's a lot of splattery, oozey sounds going on with the gore. This works well with the zombies, but with guys like the demons, and bigger demons, the sounds should be a lot more of a hard thud or whacking sound, as well as some splattery sounds for the gore. These demons are very muscular and stronger than the zombies, so hitting them would have, I imagine, a much harder, rock-solid impact sound. This is especially noticeable when you punch them in smash mode. A finer detail, I guess.
You've done a great job, I like this mod a lot.