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
Venusville - Prologue
Free-to-play alternative to Perimeter: Emperor's Testament — no purchase or trial window. Shares Strategy with Perimeter: Emperor's Testament.
Guide a robotic mission in Venus’s polar clouds in this space colonisation city builder. Collect energy, mine resources, balance buoyancy to stay afloat, in the treacherous Venusian atmosphere, and build a self-sufficient base while navigating storms and acid clouds to hunt mysterious anomalies.
- 6
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.
- 7
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.
- 8
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.