Dig, Build & Explore. Manage a group of colonists as they attempt to survive underground on an alien world. Automated machine construction was sent ahead to create the underground Mercury facility, but something has gone wrong. Your colonists awake to find the facility in ruin.
All Reviews:
Positive (27) - 88% of the 27 user reviews for this game are positive.
Release Date:
Oct 16, 2017

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Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: This Early Access game is 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?

“As the sole developer of Mercury Fallen, early access is a great way to support the project and build a community of players than can assist in its development through feedback, reporting and exposure. The game has already benefited greatly from community feedback and through Early Access I hope to continue to grow the community as the game evolves. Join the adventure and help make Mercury Fallen the best it can be.”

Approximately how long will this game be in Early Access?

“While the game is playable and enjoyable, there is still ground to cover with new content and updates. I tentatively estimate the final version will be released in late 2018 or early 2019”

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

“The focus of Mercury Fallen is building and exploration. Many of the core elements of building and management are in place, but will continue to be expanded upon. As development continues more focus will be put on exploration with the addition of discoveries, surface expeditions, story content and more.

Planned Features

  • Expanded technology tree
  • More crops and natural resources
  • More machines and possible upgrades
  • Explore the planet surface and uncover secrets and expansion opportunities
  • Discoverable items
  • Alien artifacts
  • Additional Cloning options and genetics
  • Deeper robotics system
  • Support for player created mods

What is the current state of the Early Access version?

“The game is in a playable state and has been enjoyed by many users via its initial release on platforms outside of Steam. The game contains many of the core elements that will continue to be added upon. In the current version of the game, the player can mine and grow resources, refine materials at crafting stations and expand the facility with additional rooms, machines and decorations. Manage colonist quirks, ailments and customization options. The focus of the game is to build, expand and explore.

Players can manage power/water distribution, resource management and more. The game has a solidly playable and enjoyable foundation and I will add even more great content.

Current Features

  • Mine and grow raw materials
  • Refine materials at various stations
  • Design and build facility rooms, machines and decorations
  • Manage colonists’ jobs and needs
  • Handle colonists’ injury and ailments
  • Control colonists’ names, jobs and outfit colors
  • Recover corrupted data to learn new blueprints
  • Take advantage of procedural generation, so that each new game is a new experience.
  • Grow clones and find additional colonists and robots hidden in collapsed areas of the map

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

“The game will most likely increase in price after early access.”

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

“Most games are only as good as the community behind it. As a single developer, it's not always easy to address all individual concerns, but I am eager to communicate with my audience via email, community forums and social media. I do my best to listen to player feedback and deliver on what makes sense for the game. I also plan to involve the community in optional test versions of the game between main game updates.”
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Recent updates View all (22)

March 20

Developer Log #30 :: Food & More

Howdy Folks. Since the last update I've been working on a bunch of new content for the next update. Things are coming along very well and I wanted to cover some of the new things coming in the next update.

More Food Options

The poor colonists are currently existing only on mashed potatoes, but more meal options are incoming. Several new alien crops are being introduced into the game. Some of these new crops will need to have it's seed discovered and researched before it can be planted. How new seed discovery items are found is still being worked out, but some of them will be discover-able in item chests similar to some of the technology blueprints. These new crop types will open up a whole bunch of new food recipes at the cook station.

Bio-Lab Room

In addition to new crops, there is a new room and new machines being added. The new Bio-Lab room will be a required room for the new Algae Farm, Aeroponics Farm and Fish Tank.

Aeroponics is a new crop growing machine that will be required for some of the new plants that won't be plantable in a normal crop field. The Aeroponics Farm will be able to grow all crops as well as a provide a bonus growth speed, and possible bonus yield, to crops that can be grown in the crop field. The trade off to the Aeroponics is that it will require power, water and botanical nutrients to operate. This does not replace the crop field as Aeroponics will only be available after certain discoveries and research.

The Algae Farm is used as an additional food source for new food recipes. There are some additional plans for Algae that will come in future updates as well.

Finally the colonists will have a source of protein from the Fish Tank. I'm still working on the over all production cycle of the fish tank, but the end result means some fish based meal options.

And More
While the core focus of the next update is the new food recipes, crops and room, there are some additional things that I'm working on that may make it's way into the next update. One feature I'm working on is colonist machine rosters. This would work by selecting a production machine and choosing what colonists can operate that machine. When a colonist looks for a job they will only be able to work at a machine that does not have anyone on its roster or a machine that has a roster with their name on it. Each machine can have multiple colonists assigned to it and this new system should allow for better control over where a colonist is working as well as ensuring the various machines get properly utilized. This new system is very much still in the design phase so any and all feedback is welcome.


There is still a lot more work to be done for the next update, but it's progress is coming along very well so far. Thanks to everyone who has provided some great feedback so far. Let me know what you think about these new features.


4 comments Read more

March 9

Alpha 0.13a Now Live!

Alpha 0.13a is now available. This is a minor, but critical, update to resolve crashing issues for Mac users. There are a few additional tweaks and fixes included as well.

Release Notes
  • Added: Robot charge pad now has a particle effect when in use.
  • Changed: Additional aspect ratios now supported under resolution options
  • Changed: Game no longer defaults to full screen when opening for the first time
  • Changed: Game now available in both 32 bit and 64 bit for Windows.
  • Changed: Mac version now requires 64-bit CPU/OS
  • Changed: Windows version no longer supports DirectX 9.
  • Changed: Migrated code/assets to latest version of the Unity engine.
  • Changed: Object blueprint build info now has a progress bar and item grid to show needed vs. supplied resources.
  • Changed: Build info window now shows it’s build position number in the build queue.
  • Fixed: Game crashing at startup on Mac.
  • Fixed: Unable to place floor tile next to objects that use empty tiles in its footprint. This is most noticeable if trying to place a different floor tile other than bedroom floor to the left/right of the head of a bed.
  • Fixed: Colonists walking around with zero health
5 comments Read more
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About This Game

The game is in the early access alpha stage and is not yet feature complete. Please read the Early Access info at the top for more details.

Manage a group of intrepid colonists as they attempt to survive on an alien world. Automated machine construction was sent ahead to create the underground Mercury Facility, but something has gone wrong. Your colonists awake to find the facility in ruin. Expand the colony, grow crops, build structures, recover technologies and discover lost secrets to ensure the survival of your new home away from home.

Mercury Fallen is a simulation game which focuses on building, crafting and exploration. The choices you make will decide the fate of your colony.

Dig For Resources

Mine the surrounding area for valuable raw resources. Refine raw materials for use in facility expansion.

Grow Crops

Grow crops for both food and materials.

Manage Colonists

A healthy colonist is a happy colonist. Manage colonist job roles, injuries and ailments. Each colonist may have their own set of Quirks which affects a colonist in various ways. Colonists screen allows for easy management of job roles and monitoring over all facility health.

Power & Water

Design and layout your power and water lines. Manage fuel consumption and strategically place power and water generators to ensure resources can cover the distance to devices in need.


  • Manage colonists’ injuries, ailments, jobs, quirks and needs
  • Refine materials and build technology at various stations in order to design and create facility rooms, machines, decorations and more.
  • Discover additional colonists and robots hidden in collapsed areas of the map
  • Customize your colonists name and outfit colors
  • Recover corrupted data to learn new blueprints and recipes
  • Take advantage of procedural generation, so that each new game is a new experience.
  • Grow clones and assemble robots to expand your facility population

System Requirements

Mac OS X
    • OS: Windows 7 / 8 / 10
    • Processor: 2.4 GHz Dual Core
    • Memory: 4 GB RAM
    • Graphics: DirectX 11 compatible card (shader model 3)
    • DirectX: Version 11
    • Storage: 300 MB available space
    • Memory: 8 GB RAM
    • Additional Notes: 64-bit CPU and OS
    • OS: OS X 10.9+
    • Processor: 2.4 Ghz Intel Core i5
    • Memory: 4 GB RAM
    • Graphics: Intel HD 4600 (AMD or NVIDIA equivalent)
    • Storage: 300 MB available space
    • Additional Notes: 64-bit CPU and OS
    • Memory: 8 GB RAM
    • Additional Notes: 64-bit CPU and OS

What Curators Say

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