Really cool game you've made!
Everything runs real smooth and the graphics are a nice nod to retro games such as Doom. Speaking of which, I think you made Doom fans proud with this game. It is fun, yet challenging at the same time!
I have to say, at first, the camera was a little weird to me, but once you get used to it, it really works well.
Unfortunately, I did not get to finish the demo, but that's because of my personal preference and taste in games, not because of this game itself.
I've also made a video on my experience playing the game, feel free to have a look, and best of luck with the project!