Single-player games like Illegal Alien Tower Defense
Below are 9 single-player Steam games similar to Illegal Alien Tower Defense, 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 Illegal Alien Tower Defense page.
Ranked picks
- 1
Thronefall
Single-player alternative to Illegal Alien Tower Defense — playable solo, no multiplayer required. Shares Strategy with Illegal Alien Tower Defense.
A minimalist game about building and defending your little kingdom.
- 2
Dampf - The Cozy Tower Defense
Single-player alternative to Illegal Alien Tower Defense — playable solo, no multiplayer required. Shares Strategy with Illegal Alien Tower Defense.
Cozy tower defense meets stylistic futuristic steampunk. Manage resources, buildings & towers. Unlock perks to further specialize yourself. Plan your defense & survive all enemy waves.
- 3
Robugs
Single-player alternative to Illegal Alien Tower Defense — playable solo, no multiplayer required. Shares Strategy with Illegal Alien Tower Defense.
Build your tower floor by floor and face the mechanical bugs attacking your stronghold! Add, upgrade and synergize floors of your tower to adapt to the expanding enemy paths, spanning many regions of this tower defense game.
- 4
TD Worlds
Single-player alternative to Illegal Alien Tower Defense — playable solo, no multiplayer required. Shares Strategy with Illegal Alien Tower Defense.
TD Worlds is a dynamic, highly strategical game that challenges your skill. Build an impenetrable defense and get ready to plunge into a new, unknown world to uncover its secrets. Use Twitch integration and play with your viewers.
- 5
Cube Guardian : Tower Defender
Single-player alternative to Illegal Alien Tower Defense — playable solo, no multiplayer required. Shares Strategy with Illegal Alien Tower Defense.
Cube Guardian: Tower Defender is a rogue-like tower defense game on a procedurally generated, cube-based battlefield. Protect the Nexus by strategically placing resource buildings as enemy waves intensify every 10 seconds. Earn XP to unlock upgrades and beat your high score!
- 6
Plot Twist
Single-player alternative to Illegal Alien Tower Defense — playable solo, no multiplayer required.
Welcome to Plot Twist, where you take on the role of an ambitious writer in a world of stories and inspiration. You will manage your own writing career, create bestsellers, gain fans, and shape the history of literature! Your success depends on making the right decisions and your creativity!
- 7
The Aether Project
Single-player alternative to Illegal Alien Tower Defense — playable solo, no multiplayer required. Shares Strategy with Illegal Alien Tower Defense.
A classic tower defense game with evolving battlefields and relentless waves. Build deadly defenses, adapt to new attack routes, and survive escalating enemy assaults.
- 8
Wandering Monolith: Rogue TD
Single-player alternative to Illegal Alien Tower Defense — playable solo, no multiplayer required. Shares Strategy with Illegal Alien Tower Defense.
You are the Wandering Monolith, falling from the sky. Summon towers, expand the board, defend your core, and build your deck of upgrades to conquer countless worlds.
- 9
Skeleton King
Single-player alternative to Illegal Alien Tower Defense — playable solo, no multiplayer required.
Lose yourself in this relaxing, realistic runner while realizing it's really about a restless reliquary that's actually rather scary, due to the animated skeletons. It's an atmospheric, spooky, casual game that's perfect for Halloween fun!