A downloadable game for Windows and macOS

Buy Now$14.99 USD or more

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


  • Grow clones and assemble robots to expand your facility population
  • Manage colonists’ injuries, ailments, jobs, quirks and needs
  • Grow various terrestrial and alien crops for material and meal production.
  • Explore the planet surface in search of new resources and discoveries.
  • Uncover additional colonists, robots and discoveries hidden in collapsed sections of the Mercury Facility
  • Build and manage power and water resources.
  • Customize your colonists name and outfit colors
  • Research technology to unlock new structures, recipes, crops and more.
  • In game guide 
  • Take advantage of procedural generation, so that each new game is a new experience.

Mercury Fallen is being developed by Tim Pelham which is the entire team of Nitrous Butterfly. There is a lot of exciting things to come for Mercury Fallen and a huge thank you to those that join the adventure.

Early Access Alpha

Purchase Mercury Fallen today and join the adventure as the game continues development. There are a lot of great things planned and with support and feedback from great players like you I can ensure Mercury Fallen is the best it can be. Get a copy of alpha and get all future updates including the final release.

  • Get access to all future updates

If you have purchased a copy of Mercury Fallen please click here for information on how to claim your Steam Key.

Alpha Demo

The alpha demo is from a very early version of development. It has remained here for legacy purposes, but does not reflect many of the current features of the full version.

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Minimum System Requirements


OS: Windows 7 / 8 / 10
Processor: 2.4 GHz Dual Core
Memory: 4 GB RAM
Graphics: DirectX 9.0c compatible card (shader model 3)
Storage: 200 MB available space


OS:  OS X 10.8 
Processor: 2.4 Ghz Intel Core i5
Memory: 4 GB RAM
Graphics: DirectX 9.0c compatible card (shader model 3)
Storage: 200 MB available space

Published Apr 07, 2017
StatusIn development
PlatformsWindows, macOS
AuthorNitrous Butterfly
GenreStrategy, Simulation, Survival
Tags3D, colony, Crafting, sci-fi
Average sessionA few hours
InputsKeyboard, Mouse
LinksHomepage, Twitter, Community, Community


Buy Now$14.99 USD or more

In order to download this game you must purchase it at or above the minimum price of $14.99 USD. Your purchase comes with a Steam key. You will get access to the following files:

Mercury Fallen Alpha - Mac 94 MB
Version 0.16
Mercury Fallen Alpha - Win 85 MB
Version 0.16

Download demo

Mercury Fallen Alpha Demo Win 34 MB
Mercury Fallen Pre-Alpha Demo Mac 49 MB

Development log

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