Neptune Have Mercy cover art

Neptune Have Mercy

Explore the depths of an alien ocean in a sci-fi submarine roguelike. Navigate procedural cave systems, fight bizarre sea creatures, solve puzzles, and upgrade a submarine.

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Neptune Have Mercy is a video game.

Verified Sources: IGDB

The premise, in the publisher's words

Explore the depths of an alien ocean in a sci-fi submarine roguelike. Navigate procedural cave systems, fight bizarre sea creatures, solve puzzles, and upgrade a submarine.
Description from the publisher · source