Hollow Knight - Toxic Slug Enemy Concept

This is an Enemy design I did 2 years ago for a homework. The subject was to create an enemy in the style of Hollow Knight and to add this enemy on a background.
I chose to work on a Toxic Slug enemy, based on the Arion hortensis for the color palette. I shaped it like a bodyguard or a mafia boss in a suit with "wide shoulders". For the "poison side" of the design, I thought: "What if the slug is immune to slug pellets? What if it can use this poison to kill instead of being killed?". It attacks with its sensory tentacles as a whip, but it can also use a poisonous spit on the player.