Spawn The Aliens: Idle TD

The aliens are invading, and you are in command.

Spawn powerful alien units, break through the last human defenses, and turn every attack into fuel for your growing invasion. Spawn the Aliens: idle TD combines reverse tower defense battles with idle progression, strategic upgrades, and rewarding prestige mechanics.

BUILD YOUR ALIEN ARMY

Unlock new alien types, upgrade their strength, and choose the right team for each assault. Every alien brings different advantages to the battlefield.

ATTACK THE DEFENSES

Take the attacking side in reverse tower defense battles. Manage your energy, time your deployments, and overwhelm increasingly powerful human bases.

GROW AN IDLE EMPIRE

Unlock and improve resource-producing areas to generate gold over time. Return to collect offline rewards and keep your invasion moving forward.

UPGRADE YOUR COMMAND CENTER

Invest in permanent improvements that strengthen your economy, reduce costs, boost energy, and give your alien forces an edge.

PRESTIGE AND RETURN STRONGER

Reset your progress to earn prestige currency and unlock lasting upgrades. Each new invasion becomes faster and more powerful.

COMPLETE DAILY MISSIONS

Take on daily objectives, earn extra rewards, and find new reasons to expand your alien army every day.

FEATURES

• Reverse tower defense gameplay where you command the attackers
• Idle gold production and offline rewards
• Multiple aliens to unlock and upgrade
• Strategic squad selection and energy management
• Command Center upgrades for lasting progression
• Prestige systems that make every new run stronger
• Daily missions and rewarding progression
• Works offline — play anywhere without an internet connection

Build your forces, destroy the defenses, and lead the alien invasion!