Abyssal Sub Descent

Abyssal Sub Descent is a 2D submarine resource management and deep-sea survival game.
Players manage ballast pressure and oxygen supplies while descending through hazardous oceanic trenches.

Key Features:
- 2D submarine descent survival gameplay with physics-based buoyancy and depth mechanics.
- Balance reactor power between ballast thrusters, oxygen scrubbers, and active sonar.
- Monitor real-time oxygen depletion and replenish reserves by gathering hydrothermal vent bubbles.
- Navigate past hostile bioluminescent abyssal creatures patrolling deep ocean trenches.
- Dodge mineral spires and underwater geological obstacles during descent.
- 5 progressive depth tiers scaling water pressure, oxygen consumption rates, and creature speed.
- Real-time HUD showing depth in meters, oxygen gauge, hull integrity, and research data score.
- Dynamic bubble particle system and sonar shockwave visualization.
- Complete screen navigation: Splash screen, Main Menu, Submarine Descent level, Pause screen, Critical Hull Collapse game over, Research Habitat Docked victory screen, Submarine Config settings, and Pilot Logbook manual.
- Procedural sound synthesizer and pressure-sensitive haptic vibration effects.
- 100% pure native Android Java game with XML layouts, Canvas rendering, and complete offline functionality.