Sensitivity was set to 1, so it almost seemed like my mouse input wasn't being captured... I think this would be a bug to be set so low? Also why is aim sensitivity also a thing, and it doesn't seem to do anything?
Why do I leave a brown fart cloud when dashing. I know it's supposed to be dust, but it's reallly unconvincing.
Some of the text is a too long to read it all before disappearing, especially when they show up in the middle of a fire fight.
On the pistol ironsight mode, the gloves either clip into the z plane or there's a weird shadow that doesn't look intended, at the bottom of the hands.

You can dash then slide to get a speed slide, but I don't understand why I can't dash while already crouching to such a move.
Dying in the combat test sends you back to the beginning of the tutorial...
You need an audio cue when out of ammo, I click and it makes no sound so for a second I just assume it's still playing the aim down sights animation so it isn't registering.
From where these dead bodies are, they were shooting through the wall and hitting me on the opposite room across the hallway that is in view. Or, at least I couldn't see how they could see me.

Funny shadows of the guns/hands, the red dot shadow isn't even remotely close. Probably should just disable shadows on them.

Got to 2nd level, it feels cheap that I can't shoot through this gate.

It both looks bad and is annoying to be hung up by a singular floating chunk of wall. I'd try removing any chunks that aren't attached to the ground(more correct way) or the easy way of deleting any chunks that has no other chunk neighbor, to make it a little bit better.
So not that much new content, but the game's still great fun. I think you also beefed up the graphics, so that's nice.