Played all the way through, not bad! Short and sweet.
You want to make sure the enemies don’t feel like bullet sponges… Since the full-auto weapon makes that kind of necessary for balance, I would recommend making enemies stop for a moment when they take damage (see Pinky Demons from the original Doom). And some flashy feedback effects wouldn’t hurt either.
Lastly, the thumbnail reminded me of DUSK lol. Keep it up!