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Mossu
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Mossu is a botanical cubesat terrarium floating through the real solar system, with you and your friends as it's caretakers! Hands on plant growth, cubesat construction and exploration in your shared, persistent craft. Go from Earth orbit to the Martian surface!

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Features
Languages:
Interface Full Audio Subtitles
English ✔ ✔

Coming Soon To Early Access

The developers of this game intend to release as a work in progress, developing with the feedback of players.

Note: Games in Early Access are not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“Mossu’s core experience: Earth orbital flight, Lunar and Martian exploration, cubesat construction, rover physics, and real plant care is already playable. Early Access lets players jump in now while we continue expanding the solar system, adding new modules, refining art, and growing the plant library.”

Approximately how long will this game be in Early Access?

“We expect Early Access to last 6–12 months, depending on community feedback and the scope of new systems we add.”

How is the full version planned to differ from the Early Access version?

“The full release will include more destinations, more plant species, additional cubesat modules, deeper multiplayer systems, expanded missions, and improved surface detailing. Early Access focuses on the Earth Orbital, Moon and Mars orbital/surface play, construction, and cooperative exploration.”

What is the current state of the Early Access version?

“Early Access includes:

- 5 destinations

- Cooperative multiplayer

- Real‑scale Earth orbit, Moon, and Mars

- Research, Comms, Shop, Mission, and Construction panels

- A functioning economy

- Fast‑travel between major craters and landmarks

- 10,000+ real stars and accurate sky motion

The core systems are stable, expressive, and ready for players to explore.”

Will the game be priced differently during and after Early Access?

“Early Access backers receive a discounted price. The cost will increase for full release.

”

How are you planning on involving the Community in your development process?

“We’ll work closely with players through Steam, Discord, and social channels. Feedback, suggestions, and discussions will directly shape new modules, plant species, missions, and construction tools throughout development.”
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Download Mossu Demo

This game is not yet available on Steam

Planned Release Date: Oct 28, 2026

This game plans to unlock in approximately 8 days

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About This Game

Mossu is a cubesat terrarium drifting through the solar system, where you explore real places and care for real plant species. Build your craft, expand your rover, and travel between Earth, the Moon, and Mars in a cozy, physics‑driven sandbox.

Grow scientifically‑grounded plants inside your orbital garden while navigating real terrain outside. Fly through orbit, descend to the surface, and drive rovers across crater fields with true mass, balance, and tumbling behavior. Every module you place affects how your craft moves, survives, and feels.

Each of Mossu’s 14 plant species is modeled with accurate morphology and physiology. They respond to climate, crowding, temperature, and shared resources — from warm orbital growth to cold Martian nights. Shape them with pruning, water their roots, and bring them from seed to pollination with the help of tiny drones and space bugs.

Start in a 10cm cubesat and expand in any direction. Build rooms, stacks, stilts, terraces, or tall wobbling towers, Mossu’s construction system is expressive and fully simulated. Everything you add changes your center of mass, heater load, lighting, and rover stability.

Play solo or cooperatively with friends as you explore real‑scale Earth orbit, the Moon, and Mars. Hunt for resources, complete missions, trade, research, and customize your craft together. Mossu’s systems are tactile, interconnected, and always grounded in real rules.

Features

  • 14 real plant species with accurate growth and physiology

  • Neighbor‑aware climate, crowding, and resource sharing

  • Cubesat terrarium building with freeform expansion

  • Real rover physics with weight, balance, and tumbling

  • Microgravity drift and orbital motion

  • Hands‑on plant care: prune, water, feed, clean

  • Real‑scale Earth orbit, Moon, and Mars with accurate sky motion

  • Cooperative multiplayer across the solar system

  • Research, Comms, Shop, Mission, and Construction panels

  • Simple modding support for plants, modules, and assets

System Requirements

    Minimum:
    • OS: Windows 10
    • Processor: Intel i7 9700k
    • Memory: 16 GB RAM
    • Graphics: Intel UHD 630
    • DirectX: Version 11
    • Storage: 2 GB available space
    Recommended:
    • OS: Windows 11
    • Processor: Intel i7 9700k
    • Memory: 16 GB RAM
    • Graphics: Nvidia GTX 970
    • DirectX: Version 12
    • Storage: 2 GB available space
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