The game revolves around exploring an alien world and restoring its natural beauty by removing the titular sludge.

: The practical, cautious pilot who stays with the ship and worries about their growing debts.Their dynamic shifts from a simple business partnership to a deeper conflict over their responsibility to the environment versus their own survival. Critical Reception

Critics generally praised the game's visuals and the satisfying loop of cleaning the environment, but some noted that the gameplay could feel routine.

The narrative is driven by the relationship between the two main characters:

: The adventurous and impulsive explorer who wants to save the planet.

: The contrast between the dark, oozing gunk and the lush, restored biomes is a highlighted feature, especially on modern consoles.