Poison Gas (55g) - Persistent area DoT. Tiers: Toxic Cloud → Plague
Barricades (10g) - Wall segments to funnel swarms into kill zones.
Enemies: Zergling (1HP, fast, swarms), Exploder (explodes on death, damages towers), Spitter (ranged attack on towers), Breeder (spawns 3 zerglings on death)
Defend against endless swarms of insects and creatures. Use area-of-effect towers to control massive enemy groups. Swarm-focused defense game with crowd control mechanics.