Thousands of alien machines are descending on Earth's first interstellar colony in this massive-scale new tower defense game from the publisher of Ashes of the Singularity and Sins of a Solar Empire: Rebellion.
Recent Reviews:
Very Positive (12) - 83% of the 12 user reviews in the last 30 days are positive.
All Reviews:
Mostly Positive (69) - 72% of the 69 user reviews for this game are positive.
Release Date:
Apr 16, 2019

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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?

“Feedback and testing are critical for game development. We are constantly iterating and trying out new ideas and we need players to help us through that process in order to deliver the best game possible at release.”

Approximately how long will this game be in Early Access?

“Siege of Centauri is well on its way to completion, but it still needs time for polish and iteration. We want to be able to have the opportunity to weigh player feedback and make changes based on that as well. Our goal is to release the game in the Summer of 2019.”

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

“Right now, we only have a select number of missions and maps available. By the time the game releases, we will have full campaigns and a large set of maps, complete with voice acting, graphics, and other additional game polish. We will introduce new mechanics, bug fixes, and further iteration on the game throughout the Early Access period.”

What is the current state of the Early Access version?

“Currently, players have access to the campaign mode, with survival mode coming later. As development continues, we will add more missions into the campaigns, new terrain types, and new enemy types. Leaderboards and rankings are also on the way, along with additional polish through bug fixes and iteration, the addition of voice acting and cinematics, and modding tools.”

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

“After Early Access, the price may gradually raise as more features and content are added in. We have not finalized the price for release.”

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

“Community is so important to us, which is why we choose to offer Early Access. We need your feedback on balance, wishlists for future content, and bug reports. Most of all, we want you to tell us what parts of the game you’re having fun with - and also, what you’re not. We actively read the forums on Steam.”
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Recent updates View all (8)

June 6

Beta 2 for Siege of Centauri is now available!

Beta 2 is now available for the massive-scale tower defense game

Newest update adds weapon customization, new missions, and new towers

Set in the Ashes of the Singularity universe, Siege of Centauri places the player in the role of commander of the defense of Earth's first colony on Proxima Centauri. Beta 2’s new equip screen allows players to customize the towers they bring into every mission, allowing for more meaningful strategic choices.

“The enemy has a wide range of units seeking to destroy your colony,” said Derek Paxton, lead designer. “Players have access to a wide array of towers, each with unique capabilities, to choose from. Beta 2 allows players to pick the towers they want to use, rather than the game deciding for them.”

Beta 2 also adds new missions for players to explore, including one that introduces large and powerful war machines called Dreadnoughts for the first time. They will need to overcome this powerful new challenge as they deal with the swarms of enemies already attacking their base.

The Early Access program is designed to allow fans to have input into game mechanics, pacing, and balance. Stardock has been releasing frequent updates based on player feedback.

“Weekly digital updates based on player feedback well before release lets us get to a level of balance and polish that traditionally had to wait for post-release updates,” said Paxton. “We’ve been really happy with how the fans have helped shape this game so far.”

Siege of Centauri is currently in Early Access on Steam for $9.99. The final version is expected to sell for $14.99.

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May 22

Siege of Centauri: Beta Update 6


  • New Mission: Gaol. Gaol is a huge region with low paths building up to the Colony at the top. And it features a new opponent, the Hooded Turbine, a ship that combines a high speed with strong shields. They will try to rush through your defenses to get at your Colony.
  • Added upgrades to the Scavenger Modules. They are cheap and increased the range of the building.
  • Added a bunch of new music and sfx.

  • Milton- reduced the cooldown slightly.
  • Reinforcements- increased the cooldown slightly.
  • Hatchlings- Increased hit points (they weren't much of a challenge after the Clutch of eggs was destroyed).
  • Masochists- Slowed them down slightly.
  • Added a new objective to Sord, to generate 500 metal from Scavenger Modules.
  • Fission Reactors can't be upgraded until the Colony is upgraded.
  • Modified the intro camera for Circosta so that it starts focused on the Metal Refinery that the dialog is discussing.

  • Fixed an issue with Masochist targeting.
  • Fixed an issue where the Metal Refinery lost its depth when damaged.
  • Fixed the Temporal Shift ability.
  • Fixed overlapping text on the mission launch screen.
  • Fixed an issue where some objectives weren't awarding score correctly.
  • Fixed a UI issue with 4:3 ratio displays.

  • Increased the size of Sparrows slightly.
  • Objective Complete display no longer overlaps with the dialog text.
  • Tower names no longer overflow in the selection window.
  • Added category icons to the archive.
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About This Game

Siege of Centauri puts you in command of the defense of Earth's first interstellar colony. Thousands of alien machines are descending on the helpless colony and only you, with your arsenal of fast-deployed orbital defense structures (FODS) can stop them.

The enemy comes in all shapes and sizes, challenging you to counter them with the right defense in the right place. Siege of Centauri combines the best elements of classic tower defense games with the strategic depth Stardock has delivered in past titles, including Sins of a Solar Empire: Rebellion and Ashes of the Singularity.

Battle across the surface of an alien world through a series of story-driven campaigns or fight for survival in a doomed region to see how your skills match up against thousands of other players across the world.

System Requirements

    • Requires a 64-bit processor and operating system
    • OS: 64-bit Windows 10 / 8.1 / 7
    • Processor: Quad-core Intel / AMD Processor
    • Memory: 6 GB RAM
    • Graphics: 2 GB GDDR5 NVidia GeForce 660 / AMD R7 360 or better
    • DirectX: Version 11
    • Storage: 10 GB available space
    • Sound Card: DirectX Compatible Sound Card
    • Additional Notes: 1920x1080 Display Resolution or Higher; additional disk space will be required during Early Access
    • Requires a 64-bit processor and operating system
    • OS: 64-bit Windows 10 / 8.1 / 7
    • Processor: Intel Core i5 or Equivalent
    • Memory: 8 GB RAM
    • Graphics: 4 GB GDDR5 NVidia GTX 970 / AMD R9 390 or better
    • DirectX: Version 11
    • Storage: 10 GB available space
    • Sound Card: DirectX Compatible Sound Card
    • Additional Notes: 1920x1080 Display Resolution or Higher

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