Or play it letterboxed. Doom 4 called that "cinematic"
Chansaw sounds: Well, I used the sounds from doom4, they're odd all around
Shotgun: Yeah, intended because of the entire "hold to ready alt fire"
Chaingun: I didnt add smoke because in general, it obstructs waaaay too much the view, no matter how translucid i made it
RL: LOL. Not *that* wide

Sadly, making the rest of the weapon for all the sprites of the weapon is gonna be a big issue.
Pinky: As the info documentation says, pinky has a shield.
All monsters with colored blood drop also red gibblets. This is for aestetic reasons, and to make sense out of the "chainsaw only gets red stains when executing monsters"
Chainsaw alt fire will not work in bosses. Again, the documentation explains this
Wolfdude: Yes, this is because all original doom's monsters do not disappear when gibbed, otherwise the vanilla archvile would be completely useless.
Fatso poison: You mean an impact sound for the acid?