Interesting idea. I haven't seen many dungeon crawlers that are first-person. Obviously, could have used some polish, but I feel there is a foundation.
The doors sometimes not spawning in the first room likely resulted in a number of players who played your game giving up early.
I would have liked some music or at least some ambient sound. I feel it helps a lot with the atmosphere.
Melee combat is a nice choice for this type of game, although shooting-type mechanics, I find, are easier to implement.
The particle system was nice, especially when it changed color for the different enemies. Good luck with your future endeavors.
PS The dancing skeleton made me laugh out loud.