Codename: Ocean Keeper

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Ocean Keeper: Dome Survival, initially titled Codename: Ocean Keeper, is a survival roguelike video game developed by the Ukrainian studio RetroStyle Games. It combines "bullet-heaven" gameplay in the style of Vampire Survivors with underwater mining.^[1][2] Released in early access in 2024, it received a 1.0 release in May 2025.^[3][4]

The player controls a mech spider on the floor of an ocean planet, alternating between top-down combat against waves of sea creatures and underground sequences in which they leave the mech to dive into caves and mine resources.^[1][5] Resources are used to upgrade weapons and the mech between runs.^[5]

Ocean Keeper is the first PC title developed by RetroStyle Games, a studio otherwise known for art outsourcing.^[5] In an interview with Game*Spark, the developers said the concept came from imagining a roguelike set entirely underwater, and described the game as a science-fiction successor to their earlier mobile title Last Pirate: Survival Island.^[4] A demo appeared during Steam Next Fest in June 2024,^[1][2] the game entered early access later that year,^[3] and the 1.0 version was released in May 2025 for Windows, macOS and Linux.^[4]

In a preview of the demo, Destructoid praised the concept but criticised the repetitive combat audio.^[1]