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Space Mercenary Defense Force

Also known as Space Mercenary Defense Force, smdf, 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!

Last update
31 May 2026
Players now
0

Latest update

Event

v1.0.2v1.0.2.3 - Bug Fixes

Fixed issue with encounter reward upgrade choices where the sprite and colour was incorrect for synergy and final upgrades. Fixed Outer Atmospheric Lightning animation not playing correctly after pausing or levelling up…

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Update history

Browse past updates and patch notes for this game.

20 updates

Gallery

In-game media

Achievements

Community progression

Top picks from 56 Steam achievements, sorted by player unlock rates.

  • Maxxed OutPurchase & equip a fully upgraded Astral Upgrade.42.2%
  • Big WinningsWin a jackpot payout from a slot machine.39.7%
  • That New Ship SmellPurchase & equip a new ship.36.7%
  • AriesAchieve a victory (In classic mode) & unlock the Aries Celestial Modifier.31.9%
  • Prize EarningsWin a prize from a slot machine, coin toss, & wheel spin in a single run.31.2%
  • Encounters EncounteredComplete 2 encounters in a single run.20.5%