Name: Daddy Long Legs (The Rot)
Game: Rain World

Why this creature will not appear in Gassy Arcade:
Well, uh. This one should be pretty obvious. Despite being blind, these giant octopus-spider monsters will devour anything that makes any noise near them. Even the slightest noise will alert them, and they will grab whatever made the noise with their many, many tentacles, and drag it into their core. Despite this, they are never seen producing waste. I'm not sure what that would even look like...

Art by  TheOmegaError!