So, I decided to try this, and it took me so long because I'm not a huge fan of FPS games. I'm going to consider that when I rate the overall fun/difficulty LOL I suck at aiming and hitting my targets, but I acknowledge that's my fault (not the games) haha OK... moving on...
OVERALL FUN:
1. I think you have a great game here. A lot of fun, and I like the tight hallways and hordes of monsters that come at you. Throwing a flaming grenade at them was very satisfying.
2. I found the opening a bit confusing. I like your little robot companion, but some tutorials appear so fast on screen, sometimes offscreen, they're easy to miss. While the way you do messages and tutorials is creative, I feel important tutorials would be better to actually pop up on the screen as a window.
ART/GRAPHICS:
1. Very well done. Good artwork, animations, and effects. The textures look great with a lot of details. The lighting was done very well.
CONTROLS/UI:
1. Some sort of mini-map or radar on screen would help. Or at least an indicator that something is approaching you from behind. It was kind of challenging to keep scanning around to see which direction enemies were coming from.
2. There were moments when my flying robot companion was trying to tell me something with a dialogue box, but I was looking around and didn't notice it. I think some sort of audio queue would help here. Maybe a specific beeping sound effect alerting players your companion has something to tell you?
3. I can't tell if this was me... or your game's hitboxes. Like I said above... I'm really bad at shooters, so I already struggle with aiming in these games, but there were moments I felt like I was hitting the enemy and nothing was happening. I'm not sure if you just don't have an animation/health indicator, or if I was missing. This part did feel a bit off (hitboxes, etc). BUT... again... this also could have been me.
4. When you obtain new items... it would be nice if the item list (top left) went a bit slower. Sometimes they popped up really fast, and I couldn't tell what I actually picked up.
SOUND/MUSIC:
1. While I love rock music, it feels out of place in your game. You build such a great dark atmosphere at the beginning. I'm like, "Oh, this is going to be creepy." Then you go down the elevator and BOOM... Metallica is blasting in my ear. I feel you should really keep the scare factor going... more nightmarish music. Maybe some chase music. Save the intense rock music for a boss battle or a big, intense scene.
2. The rest of the sound design was good. Great background noises, the glass breaking while I was exploring gave me a couple scares, and the pickup/interaction audio was great.
I did enjoy this considering I don't really like these types of games. Well done and keep up the great work! Good luck with the development of this and future updates!