IMHO.

Single-player games like Protocol Delta

Below are 8 single-player Steam games similar to Protocol Delta, 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 Protocol Delta page.

Ranked picks

  1. 1
    GunDeck[100] — Steam game cover

    GunDeck[100]

    Single-player alternative to Protocol Delta — playable solo, no multiplayer required. Shares Action and Indie with Protocol Delta.

    GunDeck[100] is a lightning-fast twin-stick shooter where you’ll build your arsenal from randomly-dealt cards. Weapons fire in a rainbow of elements with unique effects. Dart and dodge to survive the fireworks unleashed against you, and retaliate with your own display! Can YOU survive to wave 100?

    2023ActionIndie4.99 USDDeck VerifiedSingle-playerSimilar games →
  2. 2
    Square Shooter — Steam game cover

    Square Shooter

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

    This is a minimalistic fast-paced shooter with a high level of difficulty

    2021Action1.99 USDSingle-playerSimilar games →
  3. 3
    Bit Breaker — Steam game cover

    Bit Breaker

    Single-player alternative to Protocol Delta — playable solo, no multiplayer required. Shares Action and Indie with Protocol Delta.

    Bit Breaker is a short brick-breaking incremental bullet hell. Collect resources to upgrade your balls and fight back against the nodes taking over humanity.

    2026ActionStrategyIndieSingle-playerSimilar games →
  4. 4
    ROGUELINE — Steam game cover

    ROGUELINE

    Single-player alternative to Protocol Delta — playable solo, no multiplayer required. Shares Action and Indie with Protocol Delta.

    TwIn-stick RogueLike Shoot'em up Action!

    2023ActionIndieCasual2.99 USDSingle-playerSimilar games →
  5. 5
    Super Asqr — Steam game cover

    Super Asqr

    Single-player alternative to Protocol Delta — playable solo, no multiplayer required. Shares Action and Indie with Protocol Delta.

    Super Asqr is a collection of different game types and modes, both single and multiplayer, offered under one package with simple but elegant visual/audio feature set. Being a live game and guided by community, all these game modes are shaped by player feedback!

    2022ActionIndieCasual2.99 USDSingle-playerSimilar games →
  6. 6
    Orbit Breaker — Steam game cover

    Orbit Breaker

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

    Choose a geometric core, survive escalating waves with automatic weapons, and evolve matching weapons and passives into stronger builds. Explore sectors, find unlocks, and defeat the boss.

    2026ActionCasual5.94 USDSingle-playerSimilar games →
  7. 7
    Starfighter Neon — Steam game cover

    Starfighter Neon

    Single-player alternative to Protocol Delta — playable solo, no multiplayer required. Shares Action and Indie with Protocol Delta.

    You've been dropped into enemy space. Weave your Starfighter between alien spaceships, lasers, asteroids and bombs destroying as many as you can and collecting valuable coins and powerups as you go.

    2017ActionIndie0.99 USDSingle-playerSimilar games →
  8. 8
    Chippy — Steam game cover

    Chippy

    Single-player alternative to Protocol Delta — playable solo, no multiplayer required. Shares Action and Indie with Protocol Delta.

    Chip destructible bosses apart pixel-by-pixel in this twin-stick bullet-hell shooter.

    2019ActionIndie7.49 USDDeck VerifiedSingle-playerSimilar games →