Really well done! I died at the final enemy and my hands hurt, so I don't think I will try again for now haha!
I liked it. It has a twist that other clickers don't have! The RPG battle with the loot made for something very interesting. Great job!
My only minor feedback is that the HP of the enemy drops below zero sometime.
Adding a "hp = max(0, new_hp)" could solve that pretty quickly which will compare 0 with new_hp and give you the biggest value of the 2 (not sure which langage you chose for this! that's what I use in gdscript for Godot)!
Anyway. Awesome job!