IMHO.

Single-player games like Portal Protectors

Below are 8 single-player Steam games similar to Portal Protectors, 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 Portal Protectors page.

Ranked picks

  1. 1
    Rock and Roots — Steam game cover

    Rock and Roots

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

    Rock and Roots is a captivating VR journey where you wield the power to dictate the ebb and flow of battle. Summon your enigmatic guardians of the woods with a magical hand to face the challenges. Conjure spells, dive into the magic world and reclaim your rightful place on the throne!

    2024ActionStrategyIndie14.99 USDSingle-playerSimilar games →
  2. 2
    Treefender — Steam game cover

    Treefender

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

    Relive your childhood in Treefender, a VR-exclusive 4 player online co-op base-building game where you build your own treefort and defend it against a spacesquid invasion!

    2022ActionStrategyIndie7.99 USDSingle-playerSimilar games →
  3. 3
    Save The Castle! — Steam game cover

    Save The Castle!

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

    Save the Castle is an action packed VR tower defense that places you on the field of battle. Build your army, take over any tower and turn the tide of the war!

    2025ActionStrategy9.99 USDSingle-playerSimilar games →
  4. 4
    Odin's Fate — Steam game cover

    Odin's Fate

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

    Discover Norse mythology in a story-driven Tower Defense game. Defeat hordes of enemies, develop your abilities, unlock new heroes, recruit Einherjar, manipulate time, and change your fate, Odin, son of Bor! Will you manage to stop the impending Ragnarök?

    2027ActionStrategyIndieSingle-playerSimilar games →
  5. 5
    Royale Archer VR — Steam game cover

    Royale Archer VR

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

    Use your bow to defeat the enemy and challenge the harder stage with summoning allies, setting traps, and using magic!

    2020ActionStrategyIndie12.99 USDSingle-playerSimilar games →
  6. 6
    Captain ToonHead vs the Punks from Outer Space — Steam game cover

    Captain ToonHead vs the Punks from Outer Space

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

    Ever wanted to beat a T-Rex up with a chancla, while building powerful towers that shoot piñatas, hot sauce and heat-seeking fireworks? Captain ToonHead is the VR tower defense game of your cartooniest dreams.

    2021ActionStrategyIndie19.99 USDSingle-playerSimilar games →
  7. 7
    Towers and Powers — Steam game cover

    Towers and Powers

    Single-player alternative to Portal Protectors — playable solo, no multiplayer required. Shares Action and Adventure with Portal Protectors.

    It’s time to be a god! Save your residents and keep their islands from falling to the forces of chaos in this VR tower defense game.

    2023ActionStrategyAdventure16.99 USDSingle-playerSimilar games →
  8. 8
    Uphold The Realm — Steam game cover

    Uphold The Realm

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

    Uphold The Realm is a VR Tower Defense game that lets you take command of your wargames style campaign map to interact with levels and manage towers. When your ready - Shrink down onto the table and use your archery skills to defend against the oncoming hordes.

    2021ActionStrategyIndie6.99 USDSingle-playerSimilar games →