Fixed progressive slowdown during long sessions, especially from Stage 5 onward
Fixed Continue after Game Over breaking game speed, boss patterns, and boss hit detection
Fixed Stage 2 boss becoming invincible if Phase 1 is destroyed too quickly
Fixed Stage 3 boss graphics remaining on screen after the fight
Fixed Stage 6 boss spawning / flying out of bounds
Fixed Stage 7 Red Dragon remaining on screen and attacking after being defeated
Fixed invisible enemies