Last Archer — tower defense against waves of monsters
Monsters march toward your tower in wave after wave, with almost no breaks. If one wave breaks through, your defense is done, so you need to stop every one before it gets close. You defend yourself with archery: aim and fire an arrow at every enemy while they’re still on the way in.
Sometimes there’s an explosive barrel standing near a crowd of enemies. When the monsters bunch up, it’s better to hit that: one blast takes out several at once. You face the same arrow-based defense against incoming enemies in Medieval Defense Z.