Space Shelter Alien Defense

Space Shelter: Alien Defense is a strategic auto-battle survival game where you assemble a squad of space fighters to defend your shelter from endless alien waves. Merge units, reroll for stronger allies, upgrade traits, and form the ultimate team to withstand powerful attacks. Every wave gets harder—only the smartest commander will survive! Build your formation, unleash your firepower, and protect your shelter from alien swarms! Key Features Strategic Auto Battles Deploy your units, position them wisely, and let them fight automatically against invading aliens. Merge & Upgrade Units Combine identical fighters to unlock stronger versions and dominate the battlefield. Trait Selection (Roguelite Upgrades) Choose from random traits after each wave to enhance your squad's damage, reload speed, crit rate, and more. Wave-Based Alien Survival Battle against increasingly tougher alien swarms and challenge powerful bosses. Squad Collection & Development Unlock various space units—mechs, gunners, aircraft, and more—to build unique team combinations. Reroll & Recruit System Use resources or watch ads to roll for new fighters and assemble the strongest squad. Fast-Paced & Addictive Gameplay Perfect blend of strategy, merging, and auto-combat action.