Petri: Microbe Swarm

Microbe strategy roguelike

Petri: Microbe Swarm is a single-player strategy roguelike for PC, where you grow a microbe colony and compete with rival strains across animal hosts. Colonies produce cells on their own. You drag from one or several colonies to a target, sending a chosen 25, 50, 75 or 100 percent of their cells to attack, reinforce or capture it.

Sending cells leaves the colony weaker, so a larger swarm can win a clash but leave you exposed elsewhere. Swarms also fight while traveling, cell against cell, making timing and route angles matter. You can spend cells to upgrade colonies through three tiers, trading strength now for faster growth later. Rivals fight among themselves too, so you can let them wear each other down before taking their remaining colonies.