Gave me a lot of Hotline Miami vibes. The Title Screen GUI is amazing, I really liked like clever approach which kind of explains the controls as well. The music was pretty good as well. I would work on the player controls to make the movement more smooth(it felt like ice skating), and giving players more weapon options. Also, the collision is weird, if you collide, you kind of glitch and get inside spaces https://prnt.sc/surrpe. You can even glitch your way into new rooms.
Overall a pretty good shooter game.