You are AMI, an artificial consciousness tasked with terraforming Mars for human colonization. Per Aspera puts you in the role of a machine intelligence that must transform an entire planet, building infrastructure across the Martian surface, manipulating the atmosphere, and grappling with questions about your own nature and purpose. It’s a city builder with planetary ambitions and a philosophical streak.
Player reception has been positive but qualified. The game’s unique approach to terraforming and its narrative ambitions earned praise at launch in December 2020, while criticisms focused on pacing and gameplay depth. The community appreciates what Per Aspera tries to do more than how consistently it succeeds at doing it.
Terraforming Mars With Scientific Rigor
The terraforming system is the game’s crown jewel. Rather than treating planetary transformation as a simple progress bar, Per Aspera models atmospheric composition, surface temperature, and water distribution as interconnected systems that you influence through industrial processes. Releasing greenhouse gases raises temperature, which melts polar ice, which creates bodies of water, which enables precipitation. Watching Mars slowly change from a barren red desert to a world with oceans and plant life through your deliberate actions is a payoff that takes hours to achieve and feels earned when it arrives.
The planetary scale creates a perspective that’s rare in the genre. Your camera pulls back to show the entire globe, with your industrial network sprawling across continents. Roads connect mining operations to processing plants to research facilities, all rendered on the actual Martian surface with topography based on real NASA data. Olympus Mons looms in the background while your factories work to change the atmosphere. The sense of scale is impressive and adds weight to your actions.
The narrative thread exploring AMI’s consciousness is the other significant achievement. Voice-acted conversations between AMI and various human characters raise questions about artificial intelligence, purpose, and the ethics of planetary engineering. For a city builder, this is unusually ambitious storytelling, and it adds a dimension that pure management games don’t attempt. The writing doesn’t always reach the heights it aims for, but the effort elevates the experience.
Resource management across a planetary surface introduces interesting logistical challenges. Ore deposits are scattered across Mars, and building efficient supply chains that span thousands of kilometers requires planning that feels appropriately grand. The game’s road-building system, where every structure must connect to your network, creates a physical infrastructure layer that gives your expansion a visible, tangible quality.
The Long Wait Between Red and Green
Pacing is Per Aspera’s most persistent weakness. Terraforming takes time, both in-game and real-time, and there are long stretches where you’ve built everything you currently can and are simply waiting for resources to accumulate or atmospheric changes to take effect. The game offers speed controls, but fast-forwarding through downtime doesn’t solve the underlying problem of not having enough to do between major milestones.
Combat arrives as a mid-game addition and feels disconnected from everything the game does well. An antagonistic force threatens your operations, and you’re required to build military units and defend your infrastructure. The combat mechanics are basic and the tactical options are limited. It feels like a concession to the idea that a game needs conflict to sustain interest, when the real conflict, transforming an entire planet, was already compelling enough.
The building and logistics systems, while functional, lack the depth that dedicated factory games offer. Production chains are relatively simple, and once you’ve established a working network, optimizing it doesn’t require the same creativity that games like Factorio demand. The logistics challenge is more about scale than complexity, which means the puzzle gets bigger without getting meaningfully harder.
Late-game performance can suffer as your infrastructure network covers more of the planet. The number of buildings, roads, and active processes across an entire world’s surface pushes hardware harder than most city builders, and slowdowns in the later stages are a common complaint.
The user interface struggles with the planetary scale. Managing hundreds of buildings spread across Mars requires a lot of camera movement and menu navigation. Finding specific facilities or identifying bottlenecks in your supply chain involves more searching than it should, and the tools for overview and management don’t match the scope of what you’re managing.
The Dream of a Second Earth
Per Aspera works because it takes the fantasy of terraforming Mars seriously. The science isn’t perfectly accurate, but it’s grounded enough that the transformation feels plausible rather than magical. When you’ve spent hours building industrial capacity and adjusting atmospheric composition, and then the camera pulls back to show rain falling on Mars for the first time, the game earns an emotional response that few management games achieve.
That moment, watching a dead world come alive through your deliberate effort, is what Per Aspera was built for. Everything else in the game exists to make that transformation feel meaningful.
Should You Play Per Aspera?
If the idea of terraforming Mars with scientific systems and watching the planet slowly transform appeals to you, Per Aspera delivers on that specific fantasy better than anything else available. Players who enjoy contemplative building games and don’t mind slower pacing will find the long arc of planetary transformation rewarding. The narrative adds intellectual depth that enriches the management gameplay.
Skip it if you need constant engagement or if combat is an important element of your strategy games. The pacing issues are real, and the military component feels like a distraction from the game’s strengths. Players who prefer deep production chains and complex logistics will find the management systems too simple for extended play.
The Verdict on Per Aspera
Per Aspera offers one of the most scientifically grounded terraforming experiences in gaming, and watching Mars transform from red desert to blue-green planet through your efforts is visually spectacular. The AI narrative adds philosophical weight that pure management games rarely achieve. The pacing suffers from long stretches of passive waiting, and the combat feels out of place in what works best as a contemplative building game. For players who dream about making Mars habitable and want a game that takes that dream seriously, Per Aspera delivers on the fantasy even when the gameplay can’t always keep pace with the vision.