Good progress about your player character and effect but I also can feel there's no real direction for the game, I don't understand where you want me to give feedback as 90% of the demo seems to be in a embronic state.
Doom and Quake level are boring because your control are not designed on level, I'm not talking about the enemies that probably are in WIP as that they do they only runs towards you on a straight line, I want to point out that those levels are too big with a movement that is all about pressing shift + movement to get done.
RNG and Arcade plays awkwardly cause the control scheme is just weird, there's no reason to walk in this game at the moment so I keep doing the 180 with Dash + S by mistake because my instincts tells me to run backward but i get "punished" for it, and I don´t understand the usage as with M&K are more the enough to turn.
All enemies just follow you on a straight line making them feel samey.
Mech enemies are weakest as they can only be "stunned" smaller enemies should have far less health.
Nuke effect is cool but could be too good, it stands out as the most detailed VFX of the game, forcing you to think about making everything good as the Nuke quality effect or you might have to scale it down.
The wireframe view mode is the most confusing feature as it looks like a debugging tool to check optimization, some models have far more polygons and faces than others so that would also force you to polish everything accordingly but I would suggest you to rework it or scrap it, or keep it as a nodev with far more time than me will points out all the inconsistencies with the models
Also the crosshair is still not centered where your gun shoots, the nailgun in particular doesn't shoot straight