Nice concept and I really like the visuals. It reminds me of the old Doom or Wolfenstein, except obviously you're doing more extreme things in those games! Just a quick note - I had the same issues with the scratchy audio. If you haven't already then download Audacity (it's free) and import your "bad" sounds, then export them as a WAV file (can do mp3 but for sound effects I'd use WAV) and make sure that on encoding it is either 8 bit or 16 bit as for some reason Webgl hates 32 bit and above. This worked for me so hope it helps!