Free games like Perimeter: Emperor's Testament
Below are 8 free-to-play Steam games similar to Perimeter: Emperor's Testament, ranked by player overlap and content similarity. No purchase or Steam login required to view the list. Every pick is a full free-to-play title — not a demo, trial, or time-limited giveaway. imho.run's catalogue refreshes daily, so newly free or newly popular titles surface here without manual editing.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Perimeter: Emperor's Testament page.
Ranked picks
- 1
Istrolid
Free-to-play alternative to Perimeter: Emperor's Testament — no purchase or trial window. Shares Strategy with Perimeter: Emperor's Testament.
In Istrolid you design your own unique spaceships from a large number of parts to fit your strategy and play style. With no set units or factions you are free to create a fleet where each ship has its own balanced strengths and weaknesses, from basic fighters and bombers to hulking battleships and speedy destroyers.
- 2
Galcon 2: Galactic Conquest
Free-to-play alternative to Perimeter: Emperor's Testament — no purchase or trial window. Shares Strategy with Perimeter: Emperor's Testament.
Galcon 2 is a demolition derby in space! Send swarms of ships from planet to planet to conquer the galaxy in this fast paced multiplayer strategy game!
- 3
IDUN Prologue - Frontline Survival
Free-to-play alternative to Perimeter: Emperor's Testament — no purchase or trial window. Shares Strategy with Perimeter: Emperor's Testament.
Step into the arena with IDUN: Prologue, a thrilling slice of our full-length defense RTS where real-time strategy meets rogue-lite chaos. Fight your way through unique mission objectives with overwhelming swarms of enemies.
- 4
Imperius
Free-to-play alternative to Perimeter: Emperor's Testament — no purchase or trial window. Shares Strategy with Perimeter: Emperor's Testament.
Imperius is an easy-to-learn, hard-to-master space RTS. Command devastating ships of the Imperius Navy and prove your loyalty by destroying everything in your path, no matter the cost.
- 5
Hades' Star
Free-to-play alternative to Perimeter: Emperor's Testament — no purchase or trial window. Shares Strategy with Perimeter: Emperor's Testament.
A unique space strategy game where thousands of players participate in one shared galaxy.
- 6
The Mims Beginning
Free-to-play alternative to Perimeter: Emperor's Testament — no purchase or trial window. Shares Strategy with Perimeter: Emperor's Testament.
Experience a mystical journey with the Mims in this strategic god-like adventure—build, grow, protect, and wield divine powers. Now it's completely free! Also check out our other story-rich fantasy game, The End of the Sun, where you become a tracker of mythical beings and unravel mysteries.
- 7
VEGA Conflict
Free-to-play alternative to Perimeter: Emperor's Testament — no purchase or trial window. Shares Strategy with Perimeter: Emperor's Testament.
Stake your claim, command your fleets, and wage epic war in space.
- 8
Gods and Idols
Free-to-play alternative to Perimeter: Emperor's Testament — no purchase or trial window. Shares Strategy with Perimeter: Emperor's Testament.
Take the role of a newly ascended deity in Gods and Idols. Carve your place among the stars in an open, dynamic, and massive MMORTS universe. Command the powers of the cosmos, form alliances, and use your worshipers as instruments to further your goals.