Astra Sentinel is a wave-based survival RTS where endless alien hordes relentlessly assault your planets. Build defenses, manage resources, and expand your territory under constant pressure. Every decision matters, one breach can mean total annihilation. Face escalating threats, adapt your strategy, and survive as long as you can against an unforgiving threat.
Expand your empire across diverse planets, constructing buildings and fortifications on their surfaces while simultaneously engaging in intense space combat. Seamlessly switch between planetary and orbital views without loading screens, managing both fronts in real time. Exploit each planet鈥檚 resources to grow your production, strengthen your fleet, and secure your empire against relentless threats.
Dive into survival mode with 26 scalable difficulty levels, where the threat never ends. Progress your player level, unlock powerful new units, and enhance your existing forces to tackle ever more punishing scenarios. With countless ways to expand, fight, and survive. Every run is unique, offering endless opportunities for strategic experimentation and replay.
Experience a handcrafted story campaign with unique missions, each offering distinct objectives and challenges. Lead humanity鈥檚 galactic reconquest against a devastating alien invasion threatening extinction. Meet memorable characters, make difficult choices, and survive intense battles that test your tactical skill. Every mission tells a story, combining strategic depth with narrative-driven progression for a truly immersive experience.
