Hm. It's very good on the presentation side, plus it delivers quite a good experience.
First person shooters are so damn hard to make plus to get all the details right, and you really got a strong start here.
The pro: Visuals, sound, good surprise attacks, pretty good gunplay (could be more steady, though), interesting level design. Good job 👍
The contra: First and foremost, the bossfight. It feels very enforced (like, it was your very best idea to end on a high note with a boss fight without having an interesting boss-mechanic in mind). Now, this sounds so arrogant of me, which it isn't meant to be. What I'm trying to say is: Find a better high note for the end (like a big horde with a hold-this-point-mechanic, for instance) or find an engaging boss mechanic, either would suit this otherwise excellent indie-shooter so much better than what this boss is doing (maybe take a look at doom 2016).
I also disliked th strong head-wobbling during sprint, you could be more decent on the presentation side here and it would even feel better.
Finally, a strong player-damage-feedback would be very good in my oppinion.
Okay, so... let me make this clear: This is a very, very good start. Very, very good.
Keep it up, you've proven you can make an engaing action fps here. My critics are only meant to help and mayyy come over a bit harsh, but only with the intention to help me to be precise, not because I think I could ever create in my whole life what you've done here so far. I loved the level so far.
Looking forward to a full game!! 👍