Ultima Slime

From SlimeWiki

Ultima Slime is the title of the first two one-slime based slime mods based on One Slime made by Blue Blaze Games. They're more difficult in general. Of note are the Zen Slime, Deadly Reaker, Kumdegeneon, and Ultima Slime II, who grows with each point scored.

You can play Ultima Slime I here. You can play Ultima Slime II here.