Mars Attracts Leaves Early Access as a Five-Person Team Ships Its Alien Zoo Sim
Outlier's licensed Mars Attacks tycoon sim exits a year of Early Access with Sandbox Mode, a finished campaign, and a Very Positive Steam rating.
After a year of public testing, a five-person Belfast and Dublin studio has shipped the finished version of its licensed alien theme-park sim. Mars Attracts, the first officially sanctioned game built on the Mars Attacks universe, left Steam Early Access on September 24 with a 1.0 update that adds an open-ended Sandbox Mode, a finished story campaign, and a deeper simulation underneath the jokes.
Developer Outlier built the game around a simple, cheeky premise: instead of running a zoo of animals, players run a Martian theme park stocked with abducted humans. Guests pay to watch captives in themed enclosures, and it is the player's job to keep both the humans and the Martians happy enough to keep the business solvent.
A Small Team's Big Swing
Outlier was founded in 2018 by Paul Froggatt and Matt Rathbun, and Mars Attracts is only the studio's second commercial release after the multiplayer strategy game This Means Warp. Building a full management sim with a crew that size meant competing directly with genre landmarks made by much larger teams.
"The most technically daunting task was the sheer complexity of making a full-scale tycoon game in the vein of Evil Genius, Dungeon Keeper, Theme Hospital, and RollerCoaster Tycoon with a small (5–6 person) team," said Paul Froggatt, technical director and co-founder at Outlier.
What Changed for the Full Release
The headline addition in 1.0 is Sandbox Mode, which strips out the game's financial pressure so players can build dream parks without worrying about going bankrupt. Outlier paired that with a completed story campaign, an expanded roster of maps, and an overhaul of how captive humans behave and interact with each other inside enclosures.
- An unrestricted Sandbox Mode with no financial constraints
- A finished story campaign spanning multiple park locations
- A deeper utility and infrastructure simulation layer
- Reworked human behavior, including new escape and unrest mechanics
The team also expanded the score from composer Haakon Davidsen, adding laid-back, theremin-heavy tracks to sit alongside the more frantic music used during emergencies, so the soundtrack has room to breathe between crises.
Guess Who's Ack, Ack Again
Getting the license was as much a part of the pitch as the gameplay. Outlier built an early prototype around abducting and displaying humans before the team went looking for an IP that could give that concept a personality, and landed on the 1962 Topps trading-card series that inspired Tim Burton's 1996 film adaptation. The game borrows the cult movie's saucer designs, ray-gun effects, and gleefully destructive Martians rather than the human cast, letting it lean fully into the alien side of the joke.
That retro sci-fi styling carries through the park-building itself: attractions and enclosures are dressed in the same chrome-and-neon look as the original artwork, and the game's marketing leans hard on the material's B-movie roots rather than treating the license as set dressing.
How It's Landing
Steam's own review aggregation currently rates Mars Attracts "Very Positive," with 211 of 234 reviews recommending it as of this week — a strong showing for a studio moving straight from a year of community feedback into a paid 1.0 launch. The game is priced at $24.99 on Steam, discounted 25% to $18.74 through its launch week.
Outlier has said the past year in Early Access was spent reworking core systems based directly on player feedback, rather than simply adding content, which explains why several of the 1.0 changes — the human behavior rework in particular — touch systems that were already live rather than bolting on something new. That approach mirrors what larger management-sim studios do over multi-year post-launch support windows, just compressed into a single Early Access cycle.
“The most technically daunting task was the sheer complexity of making a full-scale tycoon game in the vein of Evil Genius, Dungeon Keeper, Theme Hospital, and RollerCoaster Tycoon with a small (5–6 person) team.”Paul Froggatt, Technical Director and co-founder, Outlier
What's Next for Outlier
With Mars Attracts now out of Early Access, Outlier has already started teasing its next project, a co-op football management game called Kitman, on its social channels, alongside short clips showing off its own take on club chaos rather than on-pitch play. The studio has not given Kitman a release window yet, and Mars Attracts will keep receiving support in the meantime; Outlier's Early Access post promised continued updates once the game reached 1.0 rather than treating the version number as a finish line.
For a studio still small enough to be counted on two hands, shipping a fully licensed tycoon game to a "Very Positive" Steam rating is itself the bigger story. Evil Genius, Dungeon Keeper, Theme Hospital, and RollerCoaster Tycoon were all built by teams with far deeper benches, and Outlier's 1.0 launch is a reminder that the tycoon genre still has room for a small studio willing to take on a genre this dense.
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Sam writes about small studios and the games they ship against the odds, and turns the hardest parts of them into guides that get to the point.
