Asteroid Bastion

Beyond the last beacon marked on the map lies the Belt of Silence
— a ring of asteroids that still hold the warmth of dead stars.
There is enough ore here to last an entire shift.
But the hum of the extractors has already drawn the attention of pirates.
Asteroid Bastion is a single-player, real-time defense strategy game featuring free-form construction. Develop your mining base in the open 2D expanse of space and protect "Helios" — the energy source for the entire network.
Build wherever you choose
There are no grids, pre-set corridors, or fixed building slots. Place structures, upgrade them, and reconfigure your defenses around the asteroids. Pirates don’t head toward a designated exit point; they attack your structures directly.
Defend more than just your cannons — protect your power lines, too
Helios transmits energy to your extractors and weaponry via power conduits. Asteroids and structures can block these direct lines of connection. Losing a single conduit can leave an entire flank without power — even if every cannon on that side remains intact.
Balance resource extraction with firepower
Energy is required for both mining operations and laser fire, while minerals are needed for construction, upgrades, and missiles. Asteroid resources are finite. Shut down extractors to divert energy to your defenses, and utilize energy storage units and repair stations to survive intense combat.
Choose the right weapon for the threat
Upgrade your standard laser into a rapid-fire pulse laser or a long-range heavy-duty variant. The former is ideal for taking down incoming missiles and small craft, while the latter consumes significant energy and deals increasing damage the longer the beam stays locked on the target. Missile launchers can be used to devastate clusters of enemies with explosive force. You face seven types of pirates: interceptors, missile frigates, kamikazes, shield-bearing O-rings, swarms, motherships, and escorts.
21 levels in the "Sweet Home" base campaign:
• 2 tutorial levels covering resource extraction, energy management, and initial combat.
• 9 story-driven missions featuring new enemies and diverse objectives.
• 4 resource-gathering challenges and 3 survival scenarios.
• 3 special modes: speed-based extraction, player-triggered waves, and a testing ground.
Meet your quotas, hold out until the timer runs out, or destroy the enemy fleet. Choose between easy, normal, or hard difficulty; pause the game or adjust the speed whenever you need time to plan your next move.
Extract ore. Hold the line. Don’t let the "Helios" go dark.