I haven't got time for a full playthrough right now but a few notes:
1. No this is not an aspect from fnaf it is from zdoom I discovered it on the zdoom wiki.
2. Thank you when I finish maybe 2 or 3 map projects I might be making maps in /idgames in doomworld.
Some things you need to know --
http://www.doomworld.com/vb/wads-mods/31922-newstuff-and-idgames-faq-read-this/Did you make these MP3 tracks?
It's also against idgames/ rules to use sprites from Hexen & Strife
What will be rejected?
Uploads with long filenames (more than 8 characters).
Warez copies of anything.
Junk in ZIP files.
Uploads with no text file included.
Anything not related to any Doom engine games (like a modification for Quake 3).
Any SLIGE/OBLIGE levels.
WADs with resources used without permission (though these might slip through; if someone complains, the file may be removed).
MP3s/OGGs in WADs, unless it can be verified that the creation is original, and ideally is intended for the specific WAD file.
Copyrighted sound clips of Disney, Beavis and Butthead, etc.
Unmodified parts of any IWAD.
"Demo" WADs that are not playable in their own right (other than editing examples).
Modified id Software levels.
Trademarked or copyrighted symbols.
Files over 50MB in size without prior approval.
Any other questionable things.
Aside from that you need to CREDIT the things you're using, somewhere -- you should start doing this now, at least put a CREDITS lump in your wad.
It looks really strange to see Strife and hexen enemies in Chex, and technically you're messing up the Chex storyline, according to the intro cinematics Flemoids can't be hurt by conventional weapons, more importantly they really clash with the Chex environments in tone, you really should use a chex warrior if you want a scripted marine, that way they can get slimed, they shoot zorch, and it all makes sense. It's really bizarre to see strife guys get killed by slime.
I don't recommend you upload this to the idgames/ archive, the archive is for completed works and it's /permanent/, I would recommend posting this on the doomworld forums, maybe, to get more feedback (there's not a ton of chex players but there are some on there)
once this gets farther along in development and you have your CREDITS lump containing information about every midi, MP3 (you should really replace these with trackers or midi btw), sprite,