About the Game

A combination RTS and base builder with a brand new kind of enemy, the Calyx are a group of powerful plant-aliens that, left unchecked, quickly spread to control swathes of the map.

As the only remaining occupant of an Avaris Corporation deep-space mining vessel, you’ve arrived in orbit around a barren-looking planet. While you’re trying to get over being frozen for more than a century, you’re dropped to the surface as the ship’s AI outlines your Ore mining targets.
Build a power network, set up Harvesters and refine Ore before sending it to orbit for Credits. Build walls and turrets to protect your base. Deploy tanks and artillery to push the Calyx back before it gets too strong.
Balance your base’s energy requirements carefully to avoid vital defences being down on power.
Secure rare deposits to improve your mining and military capacity. Connect to booster buildings for additional power, mining and healing buffs.

Will you establish a strong defence, or attack the Calyx before it spreads too far? Dig in and build a massive force, or adopt a mobile and nimble strategy? There are many ways to defeat the different varieties of Calyx. Start your base wherever you like, experiment and develop your styles of play, and learn to cope with different scenarios.

Protect Data Archives to gain Research Points, and use the tech tree to unlock and upgrade more advanced units and buildings. Unlock the Inferno flamethrower and watch the Calyx burn! Build the Unit Workshop and manufacture the Goliath, a massive, multi turret tank, and boost its speed with hover technology. Unlock Orbital technologies and fire a devastating laser beam from orbit.

Protect and power communication arrays to access the corporation’s deep space network. Scan the Calyx roots to learn more about how these hostile lifeforms function. Discover new and dangerous Calyx variants as you battle to gain control of the planet and try to find a way home!

Take on the Early Access campaign:
Tutorial plus 16 maps
5 difficulty levels
Tech Tree
Earn Research Points and unlock new technologies
Upgrade units and buildings
Take on 5 species of Calyx
Watch out for the evil Liquidator AI!
Replay with Skirmish mode:
7 maps
5 difficulty levels
Set the number of Calyx roots
Choose starting resources
Configure available Ore fields
Choose your tech level and generate a layout
Share the seed with friends so you can play the same challenge



Calyx is an Early Access release, and we’d love to hear your thoughts to help shape future development.
Please jump into the Discussion Forum, or join our Discord and let us know what you think!
Screenshots
12 images
Version Information
Steam Patch Notes
Official update history
- Fix default skirmish seed codes not producing correct layouts
- Fix challenges missing events
Calyx v0.1.0.2 – Isotopes, Modules, Skirmish improvements and more
Greetings Calyx players!
We’re delighted to share our first larger update since the Early Access launch of Calyx on 29th January. It’s been brilliant to see so many of you enjoying the first part of the campaign and giving us your feedback via Discord.
Changes include:
Do more with Isotopes
Isotope Reactor
Place it on an Isotope patch, connect, and start generating power.
[img src="{STEAM_CLAN_IMAGE}/45409241/1b8ba0589d8d789a92663f9f52978cc0bd17c9f1.gif"]
Isotope Silo
Isotopes are now stored separately to Ore.
[img src="{STEAM_CLAN_IMAGE}/45409241/de6cdf0fec2d013ab03f715c2c6401423f64396c.jpg"]
3 new modules
Artillery Module
Connect this one to your power grid and the long range mortar on top will spring into life.
[img src="{STEAM_CLAN_IMAGE}/45409241/806c1457bbe2cad77da02454a7d04359ab22f94c.gif"]
Range Boost Module
Boosts all weapon ranges when connected to the grid.
[img src="{STEAM_CLAN_IMAGE}/45409241/15cdf1ab20738d9fb9f6d58c32f1f07ce4d95814.jpg"]
Calyx Suppressor Module
Power this to kill and suppress nearby spreading Calyx.
[img src="{STEAM_CLAN_IMAGE}/45409241/47aeb761142c0fee1c778338b59ca75f1c2a40e8.gif"]
Skirmish tweaks
Added 9 Challenge maps to Skirmish.
Modules are now randomised in Skirmish maps.
Removed mission timers from Skirmish maps.
Phase schedule – add Sand Storms or Solar Storms to a Skirmish.
Set the max enemy level.
Streamlined building upgrades
We’ve revamped the upgrade system for buildings so there are less steps involved. Build the relevant Workshop, and buildings can be upgraded straight away. No more researching individual upgrades! The Mining Workshop now also contains power related items, and has been renamed the Operations Workshop.
Balancing updates
Increased the health of the Meteor and Zeus Cannon units.
Reduced the cost of the Inferno unit, and increased its damage and health.
Increased the damage and health of the Goliath unit.
Gameplay changes
The Liquidator now repairs its buildings making the Orbital Laser less overpowered against it.
A new Ram formation has been added which puts heavy tanks in the front line.
We now display more stats so it's easier to judge what upgrades will do.
Quality of Life and Polish items
We now show the size of each map on the map's intro screen.
Drag to build multiple versions of buildings like solar panels, turrets and batteries.
Rebuild a destroyed building by selecting its rubble.
Added key bindings for camera rotation.
Added keyboard shortcuts for: select all units, items in the build menu, copy and repair all.
Added an undo key for buildings.
Bound the different time acceleration levels directly to keys.
The game now saves after purchasing upgrades in the Tech Tree.
You can now delete a save from the in-game load and save menus.
The last state of rotation is remembered when placing buildings.
Increased the opacity of the blue ring that shows the Ore Thumper’s area of effect.
We added death animations for Militia and Bastion roots and sprouts.
Added an animation for the Ore Transport rocket’s legs retracting / extending.
Polished the beam VFX for Communication Arrays.
Colour balancing for the Tormentor plant.
We hope you enjoy the new features and changes. We’re now moving on to implementing larger systems, and it will be a little while before our next update. In the meantime you can stay in touch via the Studio 568 Discord.
Thanks for your support!
John, Mark & Phil, Studio 568 🙂
- More forgiving rules for the "lose structures" objective - e.g. you can bulldoze deploying strutures, and we allow upgrading / replacing existing structures.
- A fix for an issue where your pop cap wasn't returned when cancelling an Orbital Drop during deployment.
- Fixed an issue where the tick on the build menu wouldn't disappear when a "build-once" building was destroyed.
- The copy feature no longer allows duplication of levelled up buildings.
- A fix for an issue where it was possible to replace a Liquidator wall with your own turret.
- Fix for a rare crash when selecting a building to build.
- When an Ore Transport is is upgraded or bulldozed, its resources are now returned.
- Refinery availability is now monitored while a Harvester is driving or waiting off-ramp.
- Command upgrades should not have been free - now fixed.
- Changes to the tech tree reset function. It now doesn't cancel free technologies, but it does re-hide Epochs.
- A fix for skirmish-only isotope patches being visible in campaign map previews.
- Separated campaign auto saves from skirmish/challenge auto saves
- Added "Reset All Research" to campaign tech tree
- Fix for a crash when buildings near map edge are attacked
- Hide save game in tutorial (where save is not allowed)
- Fix skirmish seeds generating negative values
- Prevent orbital drop on unreachable areas
- Fix for auto save stalling on long-running games
- Key hints panel is shown by default on first run
- Balance units built when multiple factories are selected
- Time stamps on save games should now be in local time
- Made push scroll more permissive
- Removed collision from bushes (it was blocking some passes)
- Reduced objective to 64 units active on "Winding Up"
- Fix for focus getting lost after saving game
- Challenges should not have had difficulty options - now removed
- Upgraded buildings count towards objectives
- Fix for smoke being invisible from some angles
- Show plant sprouts on mini-map
- Fixed HUD layout issue
- Fixed crash when ordering units to the edge of the map
- Fixed power grid spilling over edge of the map
- Fixed impossible challenge objectives
Greetings Calyx players!
We’re thrilled to announce that the Early Access version of Calyx is now available.
[img src="{STEAM_CLAN_IMAGE}/45409241/1dd0e6230d73cd2edf95410ed227ca0d498094e4.gif"]
This first official version of the game includes:
Part one of the campaign:
Uncover the secrets of the mysterious Avaris corporation
Tutorial plus 16 maps
5 difficulty levels
Take on 5 species of Calyx
Watch out for the evil Liquidator AI!
Tech Tree:
Earn Research Points
Unlock new technologies
Upgrade units and buildings
Skirmish:
7 maps
5 difficulty levels
Set the number of Calyx roots
Choose starting resources
Configure available Ore fields
Choose your tech level and generate a layout
Share the seed with friends so you can play the same challenge
[img src="{STEAM_CLAN_IMAGE}/45409241/b321c538004576a7e9600548d8f1ef9cdf0004d7.gif"]
If you’ve played any of the pre-release demos, you’ll encounter lots of other updates, including a new volcanic biome, improved VFX, more dramatic lighting and the ability to export your end of map summary as a GIF.
Why Early Access?
We’re a small team, and we’ve worked on Calyx for some time already. We believe the game already offers an entertaining mix of basebuilding, combat and storyline, but there are still mechanics, systems and features missing to make it fully rounded. By offering Calyx to a larger audience before full release, we can receive essential feedback to help us build out the experience and make the final game the best it can possibly be.
Check out our first roadmap
[img src="{STEAM_CLAN_IMAGE}/45409241/13e387d53786103fb56f72bac7787a9a8aed530f.png"]
Join the Community
Join our Discord, meet other players, swap tips, and give us your feedback. Your support means a lot to us.
Enjoy!
John, Mark & Phil, Studio 568 Ltd ːsteamhappyː
Current Release
22311808
Uploaded Apr 08, 2026
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System Requirements
How to Install
Calyx.exe to play
Troubleshooting tips
• Run Redist/_CommonRedist installers if game won't start
• Add folder to Windows Defender exclusions
• Run as administrator
Download
Direct link available
3.2 GB
22311808
D5A26C64
8657cc9ea871adeedde0ceb095e6c31988311d21dcee25685ed658233010eceb
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