Single-player games like Unearthing Invasions
Below are 8 single-player Steam games similar to Unearthing Invasions, 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 Unearthing Invasions page.
Ranked picks
- 1
Planetary Defense: An Orbital Turret Defense System
Single-player alternative to Unearthing Invasions — playable solo, no multiplayer required. Shares Action and Strategy with Unearthing Invasions.
2D space shooter and turret defense come together to create the Planetary Defense System this world needs! Shoot down asteroids and aliens and survive the bosses in this arcade like game featuring customizable satellites, projectiles, and upgradable Cannon and Planet Shield systems.
- 2
The Echoes of Mars
Single-player alternative to Unearthing Invasions — playable solo, no multiplayer required. Shares Strategy and Casual with Unearthing Invasions.
The Echoes of Mars is a voxel-style tower defence game. Defend your research base on Mars from ancient creatures by strategically placing towers and using advanced tech.
- 3
Star Duality
Single-player alternative to Unearthing Invasions — playable solo, no multiplayer required. Shares Action and Strategy with Unearthing Invasions.
A quick arcade-style shooter where you constantly have to weigh choices between improving your stats, expanding your mines, building your defenses or going on the attack, before the enemies either take your resources or overrun you
- 4
Exo-Rail
Single-player alternative to Unearthing Invasions — playable solo, no multiplayer required. Shares Action and Strategy with Unearthing Invasions.
Build up your Armored Train and fend off thousands of aliens in a faraway star system. In this tower-defense bullet-heaven, you will choose your carriages, upgrade your train, and rain down explosives to maximize defensive firepower.
- 5
PUFIWEHO
Single-player alternative to Unearthing Invasions — playable solo, no multiplayer required. Shares Action and Casual with Unearthing Invasions.
Protecting Us From Incredibly Worrisome Extremely Hostile Oddities...is what you will be doing with your football! Defend the Earth from the invading disciples of the Deranged Octopus, and learn the ultimate secret of the Universe.
- 6
Rockjack
Single-player alternative to Unearthing Invasions — playable solo, no multiplayer required. Shares Action and Casual with Unearthing Invasions.
A retro-inspired 2D space shoot-em-up. Mine asteroids! Shoot alien saucers! Get rich or die flying!
- 7
Alien Siege: Earth
Single-player alternative to Unearthing Invasions — playable solo, no multiplayer required. Shares Action and Casual with Unearthing Invasions.
Top-down arcade space shooter with retro pixel-art style. Fight waves of alien invaders across world landmarks, buy upgrades between battles, collect power ups, participate in events & missions, defeat epic bosses, and more.
- 8
SENTRY
Single-player alternative to Unearthing Invasions — playable solo, no multiplayer required. Shares Action and Strategy with Unearthing Invasions.
SENTRY is an action-defense first person shooter where you defend your spaceship against invading aliens. Plot an escape route through hostile space and battle the enemy across your vessel with the support of traps, turrets and environmental destruction.