Aqua Raiders: Treasure Trench

You control a small submersible, moving it across a grid to clear away hostile sea creatures. The main goal is to eliminate all the creatures on each level to reveal and collect the treasure they guard. The core mechanic involves a food chain; creatures will automatically attack and remove any other creature that is ranked directly below them. You spend most of your time planning moves to trigger these chain reactions, carefully positioning your sub to avoid getting caught in the crossfire. The pace is methodical, requiring you to think a step or two ahead, and the difficulty builds steadily as new creature types are introduced. It feels like a quiet, tactical exercise in cause and effect.