THE SKYDECIDES
Watch worlds breathe.
Watch worlds burn.
A 2D top-down pixel simulation where living ecosystems rise and fall under the sky you design. Shape the climate. Watch life evolve. Then stand back and let the world decide the rest.
Real-time ecosystem footage — a dense, living biome under active climate pressure, with organisms competing and disaster spreading across the terrain.
OPEN TRAILER PAGE →WHAT LIVES IN
YOUR WORLD
Every system feeds every other. Pull one thread and watch the ecosystem unravel — or flourish.
Living Ecosystems
Countless plants and animals forage, hunt, reproduce, and go extinct — all simulated in real time. Food webs, predation, and crowd-driven behaviour weave every species into a living web that can unravel at any moment.
Evolution & Genetics
Heritable mutations carry traits across generations through prerequisite-gated mutation trees. Species adapt to climate shifts, predation pressure, and resource scarcity — or disappear forever.
Design Any Creature
Build species trait by trait: modular legs, wings and true flight, aquatic swimmers, arthropod and crustacean bodies, horns, quills, camouflage, and colour patterns. Every trait drives both how a creature looks and how it behaves.
A World That Reshapes Itself
Stream-power erosion carves valleys, groundwater buffers droughts, and hydrology flows downhill in real time. Rivers, lakes, waterfalls, snow, and glacial ice emerge and shift as the climate you build drives the land.
Climate & Seasons
Design fully custom seasons, each with its own temperature, rainfall, wind, and sunlight. Localized microclimates and fog roll in and burn off as conditions shift. No two playthroughs share the same sky.
Natural Disasters
Wildfire, volcanoes and lava, meteor strikes, tornadoes, earthquakes, and thunderstorms reshape everything you built — each announced with advance warnings so you can watch the world brace, break, and recover.
Disease & Contagion
Transmissible diseases mutate and sweep through populations under their own pressures, thinning herds and toppling species that had no defence against them.
Create, Mod & Share
A visual editor builds species, scenarios, and full mods, plus custom minigames you can publish to the cloud with per-version leaderboards. Guided in-game tutorials get new players started.
OWN IT
FOREVER
One-time purchase. No subscription. Your world is waiting.
The full game and every future update, on Windows, macOS and Linux. A license key lands in your inbox the moment payment clears.
$5.99
GET THE GAME