Single-player games like BastionOS
Below are 9 single-player Steam games similar to BastionOS, 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 BastionOS page.
Ranked picks
- 1
Zero Stress King: Idle Defense
Single-player alternative to BastionOS — playable solo, no multiplayer required. Shares Strategy and Indie with BastionOS.
A short relaxing incremental game disguised as a tower defense, but enemies can’t reach your walls. Thanks to lava.
- 2
The Riftbreaker
Single-player alternative to BastionOS — playable solo, no multiplayer required. Shares Action and Indie with BastionOS.
The Riftbreaker is a solo or Co-op base-building, survival game with Action-RPG elements for up to 4 players. Hack & slash countless hordes of enemies. Build up your base, craft powerful weapons and research new inventions to survive.
- 3
Nodebuster
Single-player alternative to BastionOS — playable solo, no multiplayer required. Shares Strategy and Indie with BastionOS.
Nodebuster is a short, experimental incremental game about busting nodes and destroying reality.
- 4
Outhold
Single-player alternative to BastionOS — playable solo, no multiplayer required. Shares Strategy and Simulation with BastionOS.
Outhold is a short, strategic incremental game that blends tower defense with a deep meta-progression. Experiment with builds and find overpowered synergies to defend the dwindling fires of Outhold.
- 5
Idle Tower Defense
Single-player alternative to BastionOS — playable solo, no multiplayer required. Shares Strategy and Indie with BastionOS.
Idle Tower Defense is a game where you control a single tower to fight off hordes of enemies. No randomization. Choose from a variety of modules to create unique builds and upgrade modules and survive endless waves.
- 6
Antivirus PROTOCOL
Single-player alternative to BastionOS — playable solo, no multiplayer required. Shares Action and Strategy with BastionOS.
Antivirus PROTOCOL is an incremental game about destroying viruses. Learn and adapt, collect data, upgrade yourself, and eliminate the Virus that has taken over the world.
- 7
Monsters are Coming!
Single-player alternative to BastionOS — playable solo, no multiplayer required. Shares Action and Strategy with BastionOS.
Beware, Monsters are Coming! In this Tower-Survivor rogue-lite, you protect an ever-moving city from unrelenting hordes. Gather resources, fortify defences, and survive for as long as you can. Will you reach the Ark?
- 8
Thronefall
Single-player alternative to BastionOS — playable solo, no multiplayer required. Shares Action and Strategy with BastionOS.
A minimalist game about building and defending your little kingdom.
- 9
Angelstruck
Single-player alternative to BastionOS — playable solo, no multiplayer required. Shares Action and Indie with BastionOS.
Angelstruck is a 2D roguelite shooter where you demolish the forces of Heaven as you attempt to reach the pearly gates. Overcharge your holy rifle, and min-max your way into insane game-breaking builds. Unlock permanent capabilities and powerful screen-destroying weapons that feed on kills.