What lives in them in Mine Cells

The roster is drawn from the source game, and each one asks for a different answer:

• Leaping Zombies close the distance in a single bound, so backing away does not buy time.
• Shieldbearers block from the front. They have to be worked around rather than traded with.
• Grenadiers lob explosives from range and are best not given the space to do it.
• Disgusting Worms and the rest of the smaller enemies fill out the rooms between.

At the far end of a run sit the bosses, Conjunctivius among them, each holding its own arena. Everything drops cells, and the bigger the thing the more it drops.