- EffectsManager handles all powerup visual feedback in one place
- Replace circle trail with proper effects per type:
* Rocket: yellow->red flame particles from feet + occasional bright spark
* Propeller: white/blue wind streaks around player
* Spring: gold/green spark trail while ascending fast
- Boost start burst: two expanding rings + radial sparks + camera shake
(orange/gold for rocket, cyan for propeller, green/gold for spring)
- Boost end puff: gray smoke cloud spreading from player
- Screen edge speed lines during boost (alternate left/right edges)
- Player no longer tilts with horizontal input during boost; rocket
stays rigid upright with tiny lean, propeller has gentle sinusoidal wobble
- Fix Rocket/PropellerHat hitboxes (relative to sprite size, not magic offsets)
- Spring now destroys itself on use with squash animation instead of staying invisible
- Guard all powerups against double-trigger via consumed flag
- Save genesis glow tween reference for clean destroy
- Player.die() disables collisions (no more post-death platform bounces)
- Replace hardcoded enemy spawn cap 0.5 with DIFFICULTY.maxEnemyRate
- Enemy spawn position now anchored to platform X (-60/+60), not random
- Powerup spawn clamped to screen bounds
- Skip powerup spawn on breaking platforms (was unfair)
- ScoreManager.addPoints() public method; remove direct score mutation
- HUD elements use setScrollFactor(0) instead of per-frame repositioning
- All magic numbers extracted to SCORE / PHYSICS / POWERUP_DURATION config
- Remove dead code: showDeathVignette, drawDebug, createParticles, deathOverlay
- Remove dead constants: PLATFORM_WIDTH/HEIGHT, PLAYER_MAX_SPEED, tileBias
- Remove SUBMIT TO CHAIN fake button, replace with Coming Soon text
- Safer cleanup loop: collect-then-destroy instead of mutating during iterate
- gwei particles now have setScrollFactor(0.3) for parallax depth
