* The visuals seem a bit weird because of the highly detailed environments and "cardboard" style sprites only facing forward. (Not the same as Doom or Duke having low res sprites and "blockier" geometry).
* I did like how picking up the blue key in the bar level lead to additional guys in the previous areas.
* Rooms do feel a bit big and the level design can be a bit confusing.
* The variety of enemies and weapons seems fine and I like the car with guys coming out.
* I can't figure how enemies dropping pickups works. Is it RNG?
* The city level got super confusing by the sewer area: First there was a hole that I had to use crouch to get into and then a swimming area where I couldn't tell where to go. I think stuff like lightning, field of view etc could be improved here.
* I find it strange the game starts with the machinegun when the pistol is usually the "starter" weapon (Specially since it has infinite ammo and there's that issue where if you run out of ammo, the game doesn't automatically switch to one that does).
There are some fun parts here and maybe some comments are me being picky but some stuff does feel weird.