Changelog

• AddGame Center leaderboards — global distance & kills rankings
• AddAchievements — legs cleared, threats destroyed milestones
• AddiCloud save sync across devices
• AddLocalization — additional languages

Initial release.

• AddApp Tracking Transparency prompt — iOS 14+ ATT authorization requested on first foreground activation; AdMob starts after the user responds
• AddAirdrop supply system — green repair (+HULL) and amber rearm (+AMMO) crates parachute down the corridor
• AddPhase 6 juice — camera shake (SpriteKit camera node), stern particle wake, explosion ember bursts, Taptic Engine haptics on all meaningful events
• AddOnboarding — 6-slide animated tutorial (corridor, steer, fire, radar, supplies, ready); first-launch gate
• AddMeta-progression — SaveManager (salvage currency, unlocks, bests); MainMenuScene fleet browser; 3 unlockable hulls
• AddDifficultyCurve — 4-leg × 90 s structure, tension meter, leg progress bar, checkpoint flash
• AddRadar / fog system — descending sweep line, amber blips, ghost reveal, proximity full-reveal
• AddTomahawk fire system — tap (single missile) + hold 0.7 s (salvo of 3); tracking missiles with explosion animation
• AddSoundManager — synthesized launch chirp, explosion boom, radar ping via AVAudioEngine; no audio file downloads
• AddDrone swarm wave — 3 drones in staggered column, crossing behavior
• Add2.5D visual pass — gradient volume shading, rim highlights, depth glow, vignette, cast shadows on all entities
• AddGoogle AdMob banners — top + bottom adaptive banners; SKView inset between banners across all scenes
• AddCharge regen — countermeasure charges refill over time (~3 s/charge); partial pip fill shows progress
• AddUIScene lifecycle — SceneDelegate owns the window; programmatic scene configuration
• AddThreats — sea mines (drift), patrol boats (homing), drone swarms; SpawnDirector with leg-weighted scheduling
• AddCollisionSystem — player physics, damage/invulnerability, health bar, GameOverScene
• AddScrolling corridor — parallax two-layer water; virtual-analog one-thumb steering
• AddHUD — health bar, charge pips, distance, tension meter, leg progress bar