Utopia - Idle Tower defense

Humanity’s last city is under attack. Endless waves of alien invaders are storming your defenses. As the Commander, your mission is clear: build the ultimate Space Tower Defense system and survive the invasion.
This is more than just a TD game — it’s a full Idle City Defense strategy experience where smart upgrades and powerful weapons determine survival.
Build the Ultimate Space Defense
Construct and upgrade advanced defense towers
Unlock devastating sci-fi weapons
Research powerful technologies
Strengthen your base defense system

Deploy spaceships in massive galaxy battles
Survive the Alien Invasion

Fight endless waves of galactic enemies
Face increasingly powerful alien bosses
Adapt your strategy in real-time combat
Protect the last human city from extinction
Idle TD Progression

Earn resources even while offline
Automate your defenses
Upgrade abilities for exponential power growth
Enjoy satisfying idle progression mechanics
If you love Idle TD games, Alien Defense, or Sci-fi Tower Defense strategy, this game delivers non-stop action and deep progression.
Build. Upgrade. Survive.
The fate of humanity depends on your strategy.