Return to abyss casts the player as a heroic spirit brought back from death and sent by the God of Chaos into an abyss overrun by demons and monsters. Its premise sets up a combat-focused run through ruined places, including a former kingdom of gods surrounded by lava, a post-nuclear lost city, and a swamp planet invaded by interstellar colonists. These settings frame the conflict as a journey through distinct forms of desolation rather than a single battlefield.
Combat is built around facing vast enemy swarms with powerful weapons and automatic enemy targeting. Players can carry up to four weapons, upgrade them, and select from branching evolution routes that transform them into artifacts. The game also lists weapon accessories, deployable battlefield items, special drinks that alter the rules, and upgradeable items, giving its survival-action design several ways to shape a run. Its stated single-game format is about 15 minutes, a concise structure that helps put player-count snapshots in context: the game is designed around individual runs, not a shared multiplayer session.
The combination of escalating enemy pressure, weapon evolution, and varied battlefields gives Return to abyss its defining rhythm: build strength while fighting through a hostile environment.