Single-player games like Alien Earth
Below are 16 single-player Steam games similar to Alien Earth, 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 Alien Earth page.
Ranked picks
- 1
CARNAGE OFFERING Tower Defense
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action and Strategy with Alien Earth.
The replicator robots are back! It's 2528. The machines are increasingly infecting the planets with genetically modified monsters. Challenge them and try to stop the onslaught. Upgrade buildings and heroes, mine resources, discover technology and fight to save humanity!
- 2
Super Sanctum TD
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Strategy with Alien Earth.
Super Sanctum TD is a retro-styled Tower Defense game that focuses on strategy, customization and replayability. Build advanced mazes and construct powerful towers to prevent alien hordes from reaching the Core!
- 3
Cyber Avenger
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action and Adventure with Alien Earth.
Cyber Avenger is a top-down action game where you take on the role of a highly skilled covert operative on a dangerous mission to stop a group of terrorists. You must navigate through five maps, facing a variety of enemies, including shotgunners, snipers, melee fighters, kamikazes, and more.
- 4
Halo: Spartan Assault
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action with Alien Earth.
Halo: Spartan Assault brings the excitement of Halo combat to Steam for the very first time. Battle your way through 30 action-packed missions against the Covenant as you explore the origin of the Spartan Ops program featured in Halo 4. *DirectX feature level 10 required. *
- 5
X-Morph: Defense
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action and Strategy with Alien Earth.
Unique fusion of a top-down shooter and tower defense strategy. You are the invader! Use destructive weapons or lead your enemies into a maze of towers. Strategize in the build mode by carefully selecting various types of alien towers or throw yourself right into the heat of the battle.
- 6
Shadowgrounds
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action with Alien Earth.
Shadowgrounds breathes fresh air into the action genre with explosive combat sequences, an innovative weapon upgrade system, and an intriguing storyline. The adrenaline-pumping, top-down gameplay and audiovisual fireworks set the scene for this new action experience which also includes single computer (split keyboard or joystick) co-op...
- 7
Defense Grid: The Awakening
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Strategy with Alien Earth.
Defense Grid: The Awakening is a unique spin on tower defense gameplay that will appeal to players of all skill levels. A horde of enemies is invading, and it's up to the player to stop them by strategically building fortification towers around their base.
- 8
Aliens: Dark Descent
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action and Strategy with Alien Earth.
Drop into the gripping journey of Aliens: Dark Descent, a squad-based, single-player action game in the iconic Alien franchise. Lead your soldiers in real-time to stop a new and terrifying kind of Xenomorph outbreak on Planet Lethe.
- 9
Krush Kill ‘N Destroy 2: Krossfire
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Strategy with Alien Earth.
Krush Kill 'N Destroy 2: Krossfire is a fast and furious post-apocalyptic real-time strategy game where you have to be quick or be dead. Play as one of three unique factions in the struggle to seek out and conquer oil fields to fuel your army.
- 10
The Dame Was Loaded
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Strategy and Adventure with Alien Earth.
An adventure set in the world of a 1940s private eye. Dames are trouble, but trouble is your business. In a sleazy world of corrupt officials, stolen diamonds, lust and murder, you must solve the case and stay alive.
- 11
Radical Rex
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action and Adventure with Alien Earth.
Radical Rex is a fire-breathing Tyrannosaurus on a skateboard who has to save the dinosaur race under the spell of an evil creature.
- 12
Nightshade
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action and Adventure with Alien Earth.
The shadows of doom grow long as the ancient Egyptian villain Sutekh envelops Metro City with a wave of crime. But Sutekh's seedy underworld is about to be infiltrated by a superhero unlike the world has even seen. A superhero who can melt into the darkness like a phantom.
- 13
Power Punch II
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action with Alien Earth.
It's the year 2006. You're Mark "Tough Guy" Tyler and you've just defended your your Heavyweight title from the 9th consecutive time. After demolishing the best boxers on the planet. It's now time to face-off with the best in the Universe.
- 14
DethKarz
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action with Alien Earth.
You're one of the elite racers chosen to compete at exotic locations around the world and beyond. Strap yourself into a fusion-powered racing machine for an explosive and exhilarating futuristic racing experience.
- 15
Bop'N Wrestle
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action with Alien Earth.
Grapple your way to the top as Gorgeous Greg in this colorful classic, hailed as one of the first great pro wrestling games. BOP'N WRESTLE puts you in the ring with 10 of the meanest, baddest, biggest, toughest, ugliest pro wrestlers ever to fly off a turnbuckle!
- 16
Penetrator
Single-player alternative to Alien Earth — playable solo, no multiplayer required. Shares Action with Alien Earth.
In this addictive side-scrolling shoot-em-up from 1982, your mission is to penetrate through four defence rings, and blow up an illegal cache of neutron bombs - an almost impossible feat! Enemy missiles and radar bases track your movements, and the landscape is as treacherous as your enemies.