I'm impressed, this is very good for a solo effort. Frankly, I'm not a fan of FPS games, consequently I completely suck at them, so I died often and early - as usual, haha. Because of this, I didn't get very far I'm afraid, but there's a lot of really good stuff in this. It was also buttersmooth on my very old laptop.
You're really good at creating an intriguing atmosphere with your transitions. The handwritten font was a great choice, the music compliments it really well too.
Well done!