Fly

The Fly is one of the most ubiquitous enemies in Mewgenics, appearing in every chapter of the game. With only 1 Hit Point and a 2-damage melee attack, it is one of the weakest enemies by raw stats — but it compensates with exceptional mobility and a unique traversal advantage: Flies can pass through obstacles and walls that block all other units, letting them reach their targets by paths nothing else can take.

With 4 movement, Flies cross the battlefield rapidly, but any single-damage source drops them immediately. They leave no corpse on death, denying corpse-based abilities. Because they deal so little damage, a Fly can sometimes be deliberately left alive at the end of a fight — its low threat allows your cats to safely farm Trash Bags or collect pickups while it wanders harmlessly.

Any cat with the Tower Defense ability will eliminate Flies automatically and effortlessly, and most area-of-effect attacks clear them in passing. Champions have 5 HP and 3 damage. Their visual design carries the fingerprints of Edmund McMillen's prior work — Flies in Mewgenics share their look with the flies found throughout The Binding of Isaac.