Vortex Sub: Trench Evasion

Vortex Sub is a native Android offline submersible bullet hell action game. The core gameplay mechanics focus on continuous relative finger drag and micro-hitbox bullet evasion across deep trenches. - Continuous relative touch drag controls translating the submersible without finger occlusion - Micro-hitbox precision collision detection paired with outer graze aura ring - Graze system registering near-misses and boosting combo multiplier up to 20x - Combo decay meter displaying remaining time before multiplier tier decays - Automated forward torpedo system targeting hostile deep-sea entities - Abyssal Leviathan boss entity implementing 7 behavioral finite state machine states - Procedural bullet generators producing geometric spiral barrages and radial ring blooms - Dual-axis screen shake and haptic feedback triggered on hull impacts and depth milestones - Acoustic Sonar Bomb ability clearing all active enemy bullets and converting them into bonus score points - Three tactical power-ups: Sonar Shockwave, Phase Shield, and Chrono Current - Dedicated hardware-accelerated SurfaceView rendering pipeline operating at 60 FPS - Procedural tone and noise synthesizer generating sonar pings and impact bursts via AudioTrack - Dedicated background audio thread playing synthesized deep-sea drone notes - In-game heads up display reporting current score, depth descended, hull lives, and bomb count - First-session interactive control tutorial explaining relative drag, grazing, and bomb controls - In-game pause menu with resume, redeploy, and surface to menu buttons - Stage victory screen with star ratings and final score calculations - Defeat screen displaying final score achieved and deepest trench record score - Settings menu with individual switches for sound effects, music, and haptic feedback - How to play screen documenting evasion rules, graze mechanics, and power-up functions - About screen displaying version number 20.20.20 and offline privacy notice - Standalone offline execution storing session data in memory without internet access