Games like Oxygen: First Breath

The Squirrel's verdictEndzone - A World Apart extends the post-apocalyptic colony loop well beyond Oxygen's 3-hour free slice: radiation and drought replace oxygen scarcity as the central threat, and a full campaign runs to a median 21.8 hours at $24.99. Reviewers note that the difficulty can feel arbitrary—good runs get easier while struggling colonies face compounding penalties—which some players flag as a design flaw rather than intentional tension.

Not for you if snowballing difficulty that punishes struggling colonies bothers you, or you want content depth that justifies the DLC pricing.

The Squirrel's verdictBoth put you underground managing survival resources against a hostile setting, but Mr. Prepper is single-character bunker-building rather than colony management—no citizens to lose to preventable deaths, just you scavenging, farming beets, and following a fixed quest chain toward a rocket-launch ending instead of open-ended city survival.

Not for you if you want multi-citizen colony logistics rather than one person following a scripted quest line toward a fixed ending.

The Squirrel's verdictMercury Fallen shares Oxygen's core loop: build a colony on a hostile planet, manage food and resource stockpiles, and lose survivors to bad planning or unlucky events. It adds research trees, diggable underground bases, and companion robots. Reviewers describe tense early hours that flatten into low-risk resource gathering later, a different rhythm than Oxygen's disaster pressure.

Not for you if you want the danger and resource pressure to keep escalating through the late game rather than settling into low-stakes upkeep.

The Squirrel's verdictMake Your Kingdom: Prologue adds two mechanics absent from Oxygen: direct control of a guard character during orc attacks, and a seasonal threat cycle where winter strains food and workforce planning. Resource juggling and workforce assignment remain central, but combat interrupts the builder loop on a regular schedule. At a 2-hour median runtime it functions as a demo for a full release.

Not for you if you want a combat-free colony builder, since orc raids require you to directly control a guard character.

The Squirrel's verdictFinal Outpost: Definitive Edition centers on a strict day/night cycle: harvest manually during the day, assign guards at night, manage storage capacity, repeat. Reviewers consistently note there is effectively one viable sequence of actions—deviation ends runs quickly. At $6.99 and a median 7.5 hours, it suits players who find satisfaction in optimizing a tight, constrained loop rather than designing a sprawling settlement.

Not for you if you want strategic flexibility or multiple viable approaches, since reviewers describe a single correct action sequence with little room for variation.

The Squirrel's verdictSame post-apocalyptic colony management: assign survivors, manage food/water/resources, hold off environmental disasters. Surviving the Aftermath trades Oxygen's single scarce-resource pressure for broader base-building and outward scouting missions across a map, with a longer campaign arc instead of a tight 50-day scenario. Median playtime runs 36 hours for those who want more systems to juggle.

Not for you if you want the resource management to stay tense past the opening hours instead of settling into a slower build-and-wait rhythm.

The Squirrel's verdictDiluvian Winds shares Oxygen: First Breath's core loop: manage a settlement against weather and resource scarcity while building up storage and production chains. Instead of an ongoing colony sim, it runs through an 8-chapter story mode that ends, with a median playtime of 7.3 hours, priced at $14.99. Reviews flag storage-capacity math and late-game tedium as balance issues.

Not for you if you want an open-ended colony sim rather than a finite story mode that ends in a few hours