I am surprised by less cynical people not giving you critique, because oh boy do you need some negative feedback.
Hitboxes are awful, which for the game about precision and quick death is inexcusable, everything feels really sluggish and unresponsive, and being stuck in a wall then punching is not that good. That nicely covers the overall controls and game feel too, it doesn't seem as responsive or deep as the original even by a long shot.
More on game feel, your game both lacks much needed polish, and informational tips.
Example, running out of bullets is always a sudden shock, and gets you killed, maybe screen should shake or borders turn red, because in the pandemonium of fast-paced combat it is hard to keep track of a tiny number
Picking up weapons is unresponsive, and they don't stand out among the bodies, which makes deaths due to "Oh shit there is suddenly no weapon" that more annoying.
Visual style overall is kinda of a mesh, nothing really stands out because of your use of oversaturated pallets, which are in my humble opinion are not "aesthetic" done right, and more so colorful vomiting without darker colors.
Hopefully you listen to me and try and improve, I am stunned nobody critize the game as harshly.