IMHO.

Single-player games like Space Annihilator

Below are 9 single-player Steam games similar to Space Annihilator, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.

Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Space Annihilator page.

Ranked picks

  1. 1
    Raiders Of Below — Steam game cover

    Raiders Of Below

    Single-player alternative to Space Annihilator — playable solo, no multiplayer required. Shares Action with Space Annihilator.

    Create absurd builds, discover powerful item synergies, discover secrets, challenge the dungeon alone or with up to 4 players.

    2026ActionSingle-playerSimilar games →
  2. 2
    Railpunk Mayhem — Steam game cover

    Railpunk Mayhem

    Single-player alternative to Space Annihilator — playable solo, no multiplayer required. Shares Action with Space Annihilator.

    All aboard! Enjoy a unique, fast-paced roguelike action experience. In Railpunk Mayhem, survive relentless waves of enemies at breakneck speeds, build a powerful train to manage your crew, and strategically plan your route to the source of chaos.

    ActionIndieSingle-playerSimilar games →
  3. 3
    Fortress Merge — Steam game cover

    Fortress Merge

    Single-player alternative to Space Annihilator — playable solo, no multiplayer required. Shares Strategy with Space Annihilator.

    Merge buildings, upgrade your defenses, and protect your fortress from endless waves of zombies. Plan each move carefully, adapt your strategy, and survive as long as you can.

    2026StrategyRPGFree To PlayFreeSingle-playerSimilar games →
  4. 4
    Loot Frog — Steam game cover

    Loot Frog

    Single-player alternative to Space Annihilator — playable solo, no multiplayer required. Shares Action with Space Annihilator.

    Loot Frog is an incremental action bullet hell about breaking pots, collecting gems, and fighting an evil cult. Upgrade your gear, unlock new abilities, explore diverse biomes, and push deeper into increasingly chaotic battles.

    2026ActionIndieAdventure5.85 USDSingle-playerSimilar games →
  5. 5
    Red Rocket Defencism — Steam game cover

    Red Rocket Defencism

    Single-player alternative to Space Annihilator — playable solo, no multiplayer required. Shares Action and Strategy with Space Annihilator.

    You, a military officer from our great autocratic motherland, must protect our precious rockets from the evil capitalist enemy in this revolutionary base building strategy game. Bribe! Surveil! Purge! Imbibe! The end justifies the means when you have to protect our invaluable rockets!

    2026ActionStrategyIndie7.03 USDSingle-playerSimilar games →
  6. 6
    Mighty Miners — Steam game cover

    Mighty Miners

    Single-player alternative to Space Annihilator — playable solo, no multiplayer required. Shares Action with Space Annihilator.

    Mighty Miners is a ridiculously replayable incremental mining game. Go as deep as you can on every run. Mine more and more Mightium, discover weapons, unlock a mighty cast of characters, harvest resources, and complete tasks to become completely unstoppable.

    2026ActionSingle-playerSimilar games →
  7. 7
    Fortress Full Fury — Steam game cover

    Fortress Full Fury

    Single-player alternative to Space Annihilator — playable solo, no multiplayer required. Shares Action with Space Annihilator.

    An incremental bullet-heaven where every run feeds permanent upgrades. Defend your fortress, harvest crystals, and climb a 600+ node tech tree until your scrappy defenses become a screen-clearing arsenal against absurd swarms.

    ActionIndieSingle-playerSimilar games →
  8. 8
    Pattern Survivors: Bullet Hell — Create Chaos — Steam game cover

    Pattern Survivors: Bullet Hell — Create Chaos

    Single-player alternative to Space Annihilator — playable solo, no multiplayer required. Shares Action and Strategy with Space Annihilator.

    “Pattern Survivors: Bullet Hell” — a dynamic roguelike where you design your own attack patterns and defend your tower against endless waves of enemies. Upgrade, modify, and adapt your strategy in real time — can you survive the chaos of patterns?

    2025ActionStrategyIndie0.74 USDSingle-playerSimilar games →
  9. 9
    Hover Groove — Steam game cover

    Hover Groove

    Single-player alternative to Space Annihilator — playable solo, no multiplayer required. Shares Action with Space Annihilator.

    A physics-based platformer about a drone looking for a way. You are hovering above the ground with electric beams. Your goal is to angle the thrusters to overcome increasingly difficult obstacles. The controls are difficult, but mastering them is all the more satisfying!

    2024Action0.99 USDSingle-playerSimilar games →