The comings and going of ants are rarely fodder for a good strategy game, but when you think about it, they're tailor made. Ants have lots of natural enemies, a hive-mind social structure for you to command, and ants don't take crap from anyone (ever step on an anthill?). In Ant Raid, you take command of a group of anthropomorphized ants under attack from all sides. Snails, wasps, and all manner of other small-stature troublemakers are out to destroy the colony, and you're the only one that can stop them.
Ant Raid has a very simple concept at its core: keep the colony alive.