The level design reminds me a lot of the intro scene to Metal Gear Solid. I like the visuals and the music sounded good (could be turned up by default some more).
I ran across some bugs/issues though. My framerate wasn’t very good throughout, I haven’t used Unreal Engine before so I’m not sure how you could try and fix that. Some of the boxes in the first level rotated with my character, so jumping on them sent me flying. Sometimes it felt like I couldn’t shoot as fast as I could click.
If you are trying to make a DOOM-like game, maybe try to make an IWAD for DOOM / GZDOOM. There are a lot of tools out there for it and they come with support for basic item placement and stuff like that. Might be quicker to prototype out that way. Trenchbroom is a map editor I have used before.