Float trajectory alpha

constants.js

@@ -28,6 +28,7 @@ export const PROJECTILE_ITERATIONS_PER_FRAME = 30;
 export const PROJECTILE_ITERATION_PROGRESS = 0.01;
 export const PROJECTILE_MIN_SOUND_FREQUENCY = 220;
 export const PROJECTILE_MAX_SOUND_FREQUENCY = 2200;
+export const TRAJECTORY_FADE_SPEED = 0.6;
 
 export const PARTICLE_AMOUNT = 30;
 export const PARTICLE_MIN_POWER_FACTOR = 0.4;