Single-player games like Siege of the Isletress
Below are 8 single-player Steam games similar to Siege of the Isletress, 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 Siege of the Isletress page.
Ranked picks
- 1
Incrempire
Single-player alternative to Siege of the Isletress — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of the Isletress.
Defend. Upgrade. Dominate. A relaxing incremental base-defense game, packed with powerful skills and a deep skill tree.
- 2
Idle Survivor
Single-player alternative to Siege of the Isletress — playable solo, no multiplayer required. Shares Indie and Casual with Siege of the Isletress.
Your ship is stranded and cannot move. Something out here has woken up, and it breeds faster than you can kill it. All you can do is upgrade your arsenal and fight back, wave after wave, for as long as you can hold.
- 3
Tin Box Mobsters
Single-player alternative to Siege of the Isletress — playable solo, no multiplayer required. Shares Strategy and Casual with Siege of the Isletress.
A game about a gang of criminals that uses an old sedan and commits crimes, fends off cops, farms illegal resources, gets upgrades and builds up criminal power
- 4
Pattern Survivors: Bullet Hell — Create Chaos
Single-player alternative to Siege of the Isletress — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of the Isletress.
“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?
- 5
CoreBreaker: Desktop Swarm
Single-player alternative to Siege of the Isletress — playable solo, no multiplayer required. Shares Indie and Casual with Siege of the Isletress.
A corner screen incremental brick-breaker where bouncing cores destroy endless swarms. Let it run in the corner of your screen while you work or jump into fullscreen and take control yourself. Unlock new Cores, expand your skill tree, survive endless waves.
- 6
Screen Survivors
Single-player alternative to Siege of the Isletress — playable solo, no multiplayer required. Shares Strategy and Casual with Siege of the Isletress.
An idle survivor-like that sits in the corner of your screen.
- 7
Stick Wars: The Laneborn
Single-player alternative to Siege of the Isletress — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of the Isletress.
A 2D stickman strategy game on three lanes: you don’t micro troops you decide gold, deployments, and upgrades. Ally champions, lane-swapping bosses, and a campaign that only gets tougher.
- 8
Sir, We Have an Orc Problem
Single-player alternative to Siege of the Isletress — playable solo, no multiplayer required. Shares Strategy and Indie with Siege of the Isletress.
Sir, We Have an Orc Problem is an incremental-style tower defense game where you face an overwhelming number of orcs. Greet them with even more bullets, bombs and lasers!