Single-player games like Defending Earth
Below are 8 single-player Steam games similar to Defending 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 Defending Earth page.
Ranked picks
- 1
Admirals of Ophiuchus
Single-player alternative to Defending Earth — playable solo, no multiplayer required. Shares Action and Strategy with Defending Earth.
Design massive ships, bristling with weapons, on a macro scale. Engage in fleet-vs-fleet battles, featuring many different tactics. Play alone or in Coop combat missions, or form two teams of players (each with own fleet) to fight in an arena.
- 2
Attack on Toys
Single-player alternative to Defending Earth — playable solo, no multiplayer required. Shares Action and Strategy with Defending Earth.
Relive Your Childhood Toys comes to life! Build your Army Toys, make battle scenario, watch the Toys battling each other, and customize your play with Attack on Toys Toy Box. Command your Army Toys to fight againts another toys strategically and keep them alive during battle!
- 3
DOUGH: A Crime Strategy RPG
Single-player alternative to Defending Earth — playable solo, no multiplayer required. Shares Strategy and Simulation with Defending Earth.
A crime based 4X strategy game with heavy RPG elements. Money, power, women... in the Prohibition, the world of crime is prospering, but in it, the road to the top is filled with blood. The ruthless competition, the greedy politicians and the pesky policemen, everyone wants to come out on top!
- 4
Ares Inception
Single-player alternative to Defending Earth — playable solo, no multiplayer required. Shares Strategy and Simulation with Defending Earth.
You are the eyes and ears of mission control for the ambitious exploration of Mars. Built under the advisement of real astronauts, engineers & planetary scientists, you will choose your mission, design your hab, and manage your crew. Monitor feeds, issue orders, and react when things go sideways.
- 5
Above Earth
Single-player alternative to Defending Earth — playable solo, no multiplayer required. Shares Action and Strategy with Defending Earth.
Above Earth is a science fiction survival game. Experience a struggle for life in the fragile artificial environment of a damaged space station.
- 6
Galaxor
Single-player alternative to Defending Earth — playable solo, no multiplayer required. Shares Strategy and Simulation with Defending Earth.
Galaxor is an online sci-fi strategy game where you build planets, research technologies, command fleets and expand your empire across the galaxy. Manage resources, join clans, take part in events and face alien threats in long-term space warfare.
- 7
Rank: Warmaster
Single-player alternative to Defending Earth — playable solo, no multiplayer required. Shares Action and Strategy with Defending Earth.
Stranded on Mars with next to nothing, build a city, assemble a fleet, and expand your empire to survive a hostile solar system in this new take that combines elements of space combat and RTS inspired by the classics.
- 8
Space Reign
Single-player alternative to Defending Earth — playable solo, no multiplayer required. Shares Action and Strategy with Defending Earth.
An indie space-sim and strategy game featuring ship and fleet combat mixed with RTS elements. Complete contracts and Claim sectors for your faction in the near-future, where resource exploiting corporations are in a state of constant conflict over territory control.