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Koryos : Sons Of Mars playtest
by CosmicTwin
Shift seamlessly between overhead RTS command and brutal first-person action in the Gallic Wars. Conquer territories, build vital fortifications, and wage WAR. Your Roman troops aren't just fodder, every soldier has a name, earning ranks and a legacy as they survive the front lines.
Anyone with a Steam account can join, and it's free.
- Access
- Instant
- On playtest since
- Aug 4, 2026
- Planned release
- To be announced
- Developer
- CosmicTwin
- Platforms
- Windows
- Players
- Single-player
- Languages
- English
How to join the Koryos : Sons Of Mars playtest
- Open the game's Steam page with the Join playtest button. Sign in to Steam if it asks.
- Use the Koryos : Sons Of Mars playtest signup there. You're in straight away, with nothing to pay.
- The playtest shows up in your Steam library, ready to install and play.
New to playtests? How Steam playtests work
How AI is used
How I Use AI Human Craftsmanship First: Human creativity is always my highest priority. AI is never used to replace active human contribution in art or design. Technical Assistance: As a solo developer, I use AI to bridge the resource gap. I specifically utilize it for C++ coding, creating workflow tools, and referencing UE5 documentation to speed up development. Always Moving Forward: My focus is on momentum. I do not backtrack to rewrite functional, AI-assisted code or assets unless there is a strict technical or performance reason to do so. The Bottom Line: I know AI is a sensitive topic, but I am committed to using every tool available to bring this project to life(so long as i lack resources). I am genuinely just happy to be building the game of my dreams, and if you are passionate about what is being built here, I always welcome you to join the community or lend a hand in development!
The developer's own words, from Steam.
About Koryos : Sons Of Mars
PLAYTEST DISCLAIMER: It is very Early access. Proof of concept. Go to Tent for Character Customization, N for promotions in the fort, M for Map, and J for Objectives. Have fun and watch for Naked Gauls !
From the Commander's View to the Front Lines
Experience the Gallic Wars like never before by seamlessly shifting between overhead tactical command and intense, boots on the ground action.
- Hybrid Combat Perspective: Issue strategic orders to your formation from a tactical overview, or dive directly into first-person combat to fight shoulder-to-shoulder with your soldiers.
- Dynamic Formations: Command cohesive units of Roman soldiers.
Conquer, Build, and Defend
Securing the northern wilderness requires more than just winning battles; you must hold the land.
- Territory Acquisition: Push back the Gallic tribes, capturing vital territories and expanding the Republic's reach.
- Slot-Based Fortifications: Utilize designated build slots within captured zones to erect defensive fortifications, gather resources, and secure your supply lines.
- Epic Siege Warfare: Plan and execute devastating assaults on enemy strongholds, or dig in behind your own walls to survive relentless counter-sieges.
Every Soldier Has a Story
Your troops are not expendable, faceless units they are individuals whose lives and careers depend on your leadership.
- Persistent Careers: Every single soldier features a unique name, tracking their individual combat experience and historical career milestones.
- Earned Promotions: Watch the flesh-and-blood troops under your command grow through the fires of battle, rising dynamically from low-ranking recruits all the way to decorated officers. ROMANS
GAULS
From the game's Steam page.
