
Screenshots

Watch trailer on Steam ↗さーきゅらーディフェンス!!~とある辺境惑星開拓事務所、30日の記録~
Picola Inc. · Published by Picola Inc.
5 user reviews — 80% positive (5 reviews) · 14 achievements
Last updated 28 Sept 2026
”Sacular Defense" is a real-time tower defense game in which you intercept enemies by placing circles around them to prevent them from hitting the planet in the center of the screen. Strengthen your turrets and defend your planet from the endless enemies!
£7.49
Lowest price we've ever recorded
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Price history
Adventure, Strategy, Casual · 2026 · More £5 - £15 games
In Sacular Defense!!, manage turrets and outmaneuver endless foes as you protect your planet from the edge of space. Strategy meets casual gameplay in this unique tower defense experience.
About this game
Overview
"Welcome to Star-Smile Inc."You are the new director of the Frontier Planet Pioneering Office.
Your mission is to protect the frontier planets from the looming life form "Carolian".
Deploy weapons called "Circle Turrets" to protect the planet!
How to play
.Place the 6 types of circles at any location in the stage.Turrets placed in the circles will automatically attack enemies!
Placement of circles requires resources, so please place them systematically.
Use the stage clear rewards in the lab!
Reinforcing turrets will increase their defense!
Communication with the secretary
Communication with your secretary is an important part of the game.You can choose to talk to her or not, and her likability will fluctuate depending on your conversation choices.
Talk as much as possible to get the best ending.
*If you fail to protect your star, your secretary will have to do extra work and will become fatigued.
If you leave her tired, you may be in trouble......
System Requirements
Will my PC run this? →Minimum
- Requires a 64-bit processor and operating system
- OS: Windows 10 or Newer
- Memory: 4 GB RAM
- Storage: 2 GB available space
- Additional Notes: 1080p, 16:9 recommended
Recommended
- Requires a 64-bit processor and operating system
Supported Languages
Latest news
AnnouncementsOfficial
Official Release Now Available
Thank you very much for your continued support of Circular Defense !! ~A Certain Frontier Planet Settlement Office, 30 Days of Records~!We are pleased to announce that, as of Friday, May 29, 2026, the game has officially left Early Access and has now been fully released.Since entering Early Access in February 2024, the game has been played not only by many Steam users, but also by visitors at events such as Tokyo Game Dungeon 5 and Indie Game Market.Throughout development, we received a great deal of feedback, impressions, and bug reports, all of which became an invaluable source of support for the project. We sincerely thank everyone who played the game and shared their thoughts with us.Over the course of the nearly two-year development period, there were also times when project updates slowed down or stopped temporarily. We deeply apologize for any concern or uncertainty this may have caused to those who continued waiting for the game.Thanks to your encouragement and feedback, we were able to finally reach this official release.We will continue working on smaller updates and improvements moving forward, and we hope you continue to enjoy Circular Defense!!.Thank you again for your support.Read full article on Community Announcements (t_shiraishi)AnnouncementsOfficial
バージョン1.0.0アップデート
Version 1.0.0 UpdateVersion 1.0.0 is now live!Update DetailsStage adjustmentsAdded a dialog displaying stage information when selecting a stageAdded "Perfect" clears for stage completionAdded a "Perfect Bonus" to the results screenAdded resource rewards based on stage progression for repeat playthroughsAdded a tutorial skip option for repeat playthroughsAdded a repeat playthrough unlock dialogImproved loading times for event dialoguesAdded a recovery scenario that triggers when Secretary’s fatigue reaches a certain levelAdded a Retry button to the Pause and Results screensAdjusted/fixed various text and UI elementsBug fixesThank you for your continued support of Circular Defense!!Read full article on Community Announcements (t_shiraishi)AnnouncementsOfficial
Circular Defense!! Official Release Date Announcement
Thank you very much for playing Circular Defense!! ~30 Days at a Frontier Planet Development Office~.We are excited to announce that the game will leave Early Access and officially launch on Friday, May 29, 2026.Throughout the Early Access period, we received a huge amount of feedback, bug reports, and impressions from players both within the community and at various events. The entire development team would like to sincerely thank everyone for your support.The full release includes a wide range of updates and improvements, including:Game balance adjustmentsImprovements to the turret upgrade systemRefined stage design and progressionEnhanced visual effects and UIVarious bug fixesWe have also continued improving the game's communication events with Hishoko, one of the core features of the title, to make them even more enjoyable.We hope you enjoy the full 30-day battle to defend the frontier planet all the way to the end!Thank you for your continued support of Circular Defense!!.Read full article on Community Announcements (t_shiraishi)Patch NotesOfficial
Version 0.2.1 Update
Version 0.2.1 is now live!Update DetailsStage adjustmentsAdjusted turret statsEvent dialogues now trigger based on stage progressionAdded HP recovery when building additional turretsAdded UI for the transition from operation completion to the results screenAdjusted Secretary’s fatigue increase rateBug fixesThank you for your continued support of Circular Defense!!Read full article on Community Announcements (t_shiraishi)Patch NotesOfficial
Version 0.2.1 Update Announcement
The following updates are planned for Version 0.2.1:Stage adjustmentsEvent dialogues will now trigger based on stage progressionBuilding additional turrets will now restore HPAdded UI for the transition from operation completion to the results screenBug fixesThe update is scheduled for release on April 20.Read full article on Community Announcements (t_shiraishi)






