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
Greetings Calyx players!
Calyx v0.2.0.4 – Leviathan Update, Minor Patch
Hi everyone! We've got another small patch today, bringing the following changes:
Added different models for the different types of marine crawlers
Fixed an issue where the Zeus Cannon wasn't available to build in the Bastion challenge map
Fixed missing sound on upgraded machine gun turrets
Fixed a bug where adjusting the gamma value in the options didn't persist across sessions
Silenced a rogue module shut down sound effect that was sometimes heard when starting a skirmish
Added missing collision to a rock that appears in various water maps
As always, the #bug-reports channel in our Discord is the best place to report issues.
Thanks for your support!
Cheers,
John, Mark and Phil 🙂
Greetings Calyx players!
Calyx v0.2.0.3 – Leviathan Update Patch
We'd like to say a massive thanks to all the players who've given us feedback on the new update via Discord and the Steam Forum.
We've now published a patch with the following changes:
Re-enabled building on sand
Tanks can now knock down trees
Limited the number of marine crawlers that can spawn in very large maps (like Nexus)
Added more generous ore deposits to some of the new campaign maps where resources were a little tight
Added a message in the first map where marine crawlers are encountered, warning players to build walls
Added some extra power booster modules to the new campaign maps
Naval units are cheaper
Naval units have additional health
The game no longer automatically pauses when viewing upgrade details
Fixed an issue where the Isotope Reactor was missing from the build menu in some maps
Fixed an issue where the Repair button showed (disabled) on Data Archives
Fixed issue with stuck machine gun tracers
A fix for naval transports getting stuck when unload is triggered during loading
Fixed loaded units appearing at beach after upgrade
Added some logic to help prevent ships from ending up in strange positions on cliffs
Fixed some tech tree items showing an increase rather than a decrease in cost
Corrected a pricing error with the amount of Isotopes required to build a Goliath
Added a speculative fix for a frequent crash reported by one player, only affecting the new water maps
As always, the #bug-reports channel in our Discord is the best place to report issues.
Thanks again for your support!
Cheers,
John, Mark and Phil 🙂
- Fix default skirmish seed codes not producing correct layouts
- Fix challenges missing events
Calyx v0.0.6.5 update
Greetings Calyx players! It's now been 2 weeks since the Early Access launch, and we'd like to once again thank everyone for their feedback and bug reports.
This patch includes the following changes:
More forgiving rules for the "lose structures" objective - e.g. you can bulldoze deploying structures, 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.
It's been amazing to welcome so many new players to the community, and we're hugely grateful for your support and feedback!
We're now going to start work in earnest on larger features, and updates will be slightly less frequent as a result. In the meantime, please join our Discord to keep up with our latest plans, share your feedback and meet other Calyx players: discord.gg/EdNejFX8kn
Cheers,
John, Mark & Phil ːsteamhappyː
- 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.
Calyx v0.0.6.4 update
Campaign autosave being overwritten
We became aware of an issue where your Campaign autosave progress could be overwritten by a save from another mode.
If you never made a manual save in Campaign and you've continued to play skirmishes/challenges, you may have lost your campaign progress. Sorry about this.
There's a fix in this update (see the changes below), and we've created a group of saves for various stages of the campaign, in case that helps you to get up and running again. https://drive.google.com/drive/folders/1a76ME4-2YYNTU4Dr5HK_txiFrmQwf36K?usp=sharing
v0.0.6.4 changes
- 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
Thanks for your continued feedback and support!
Cheers,
John, Mark & Phil ːsteamhappyː
- 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
Calyx Demo v0.0.4.3
Hey everyone! 👋
We pushed a patch to address a couple of issues:
Upgraded Unreal Engine version to 5.6.1 with the aim of fixing DirectX related crashes on start up which were affecting some PCs.
Fixed an issue related to key binds and the R and X keys. Affected players may need to re-bind those keys.
Thanks!
John, Mark & Phil
Studio 568 🙂
Added Skirmish as an option on the main menu.
This allows you to configure options before playing the demo map:
- Number of Calyx Roots
- Number of Ore locations
- Difficulty, from Very Easy to Impossible
Note, this is not us responding to any of the super helpful player feedback. Skirmish is a small feature that didn't quite make the cut when we launched the demo on Friday, so we're including it today.
Thanks!
John, Mark and Phil ːsteamhappyː
Current Release
Build 24110103
Uploaded Jul 21, 2026
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
3.9 GB
24110103
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