Ecosystem is a unique simulation game that immerses players in the intricate balance of life within a physically-simulated ocean. At its core, the game features evolving virtual lifeforms created from synthetic DNA, which governs their physical structure, mental capabilities, and even combat skills. Players can release a variety of creatures into their custom environments, allowing natural selection to unfold as these beings adapt and thrive.

The game’s simulation mechanics are sophisticated, where each creature's nervous system functions as a pipeline computer, processing sensory data and coordinating movement like real aquatic life. As players observe the evolution over generations, they can influence traits such as size, body parts, and special abilities. From developing electrical attacks to creating poisonous defenses, Ecosystem’s detailed combat mechanics enrich the survival experience, putting creatures in a dynamic food chain hierarchy.

With options to sculpt and modify various terrains within the game, players can create diverse habitats ranging from deep oceans to cavernous landscapes. For those keen on statistics, Ecosystem provides extensive data on the populations and evolutionary paths of species, making it easy to track changes. The game also supports sharing via Steam Workshop, allowing players to exchange their creations and explore new lifeforms.