Great game. It's fun. The AR feels extremely nice to shoot (I didn't play around with the other weapons). I love the graphics, they're minimalistic but have a nice aesthetic. You picked an amazing song for it, it really adds to the feel of the game and made me feel powerful/badass.
The acceleration and deceleration feels way too floaty imo, and given that death seems to be so common in this game, I think it'd be nice to be able to fast-forward/skip the death bit. I found myself spamming my [E] key after each death, wanting to just jump right back into it. And I would probably put an unlocked symbol on the doors after you've unlocked them, so that they stand out.