Space Mercenary Defense Force
Defend against the alien invasion and take down the mother ship! Utilise branching upgrade trees, unlock new ships, and equip permanent upgrades to create your own unique build and defeat the growing hordes of invaders in this sci-fi action roguelike!
Offers
What are keyshops?About Space Mercenary Defense Force
Combine Different Ship Modules Each Run
Equip your ship's directional module slots with various module types such as explosive, defensive, deployable, beam, & more!Choose Your Own Upgrade Paths
Featuring over 600 upgrades with unique progression via branching paths you can make each run different and unique with your choices.Optional Encounters
Complete optional random Encounters like fighting minibosses or charging a conduit to earn rewards and further level up your ship!Dynamic Threat Events
Aliens aren't your only threat! Survive the various timed threats such as Off-World Targeting, Outer Atmosphere Lightning, Pulsing Solar Flares, & more!Permanent Upgrades And Unlocks
Spend your hard earned credits on new ships, skins, & permanent Astral Upgrades and complete objectives to unlock ship perks, and Celestial Modifiers!Game details
Game details
Age ratings
Game modes
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Space Mercenary Defense Force price history
Lowest tracked price: $2.49 (Jul 7, 2026) · current best: $4.99.
Space Mercenary Defense Force reviews
88% positive reviews all-time.
Space Mercenary Defense Force — frequently asked questions
Where can I buy Space Mercenary Defense Force at the cheapest price?
Right now the cheapest offer for Space Mercenary Defense Force is $4.99 at Steam. KingsPrice compares 1 offers from 1 stores — official stores and keyshops — and refreshes prices throughout the day.
What is the lowest price Space Mercenary Defense Force has ever been?
The lowest price KingsPrice has tracked for Space Mercenary Defense Force is $2.49 (recorded on Jul 7, 2026). This covers the stores and period we monitor — set a price alert to catch the next drop to that level.
How can I get Space Mercenary Defense Force at a discount?
Create a free price alert on this page and KingsPrice will email you when Space Mercenary Defense Force drops below your chosen price. The biggest discounts usually appear during seasonal Steam sales and publisher promotions — the sale calendar on this page shows the next confirmed event.
System requirements
Minimum
- Requires a 64-bit processor and operating system
- OS: Windows 10 64bit
- Processor: Dual Core+
- Memory: 2 GB RAM
- Graphics: 2GB VRAM
- Storage: 500 MB available space
Recommended
- Requires a 64-bit processor and operating system
