Dule a shooter game but slow mo

mySketch
Body
GameSystem
KeyInput
ObjectPool
PlayerActorState
PlayerEngine
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// Title: Duel
// Author: FAL ( https://www.fal-works.com/ )
// Made with Processing 3.3.6
/* Change log:
    Ver. 0.1 (30. Sep. 2017)  First version.
    Ver. 0.2 ( 1. Oct. 2017)  Bug fix (unintended change of strokeWeight), minor update (enabled to hide instruction window).
    Ver. 0.3 (10. Feb. 2018)  Minor fix (lack of semicolon).
    Ver. 0.4 (12. Feb. 2018)  Enabled scaling.
*/
​
/* @pjs font="Lato-Regular.ttf"; */
/*
  The font "Lato" is designed by Łukasz Dziedzic (http://www.latofonts.com/).
  This font is licensed under the SIL Open Font License 1.1 (http://scripts.sil.org/OFL).
*/
​
​
// CAUTION: spaghetti code!!!
​
private static final float IDEAL_FRAME_RATE = 60.0;
private static final int INTERNAL_CANVAS_SIDE_LENGTH = 640;
private static final boolean USE_WEB_FONT = false;
​
KeyInput currentKeyInput;
GameSystem system;
PFont smallFont, largeFont;
boolean paused;
​
int canvasSideLength = INTERNAL_CANVAS_SIDE_LENGTH;
float scaleFactor;
​
/* For processing.js
const containerRect = window.document.getElementById("Duel").getBoundingClientRect();
canvasSideLength = min(containerRect.width, containerRect.height);
*/
​
/* For OpenProcessing */
canvasSideLength = min(window.innerWidth, window.innerHeight);
​
/* For Processing Java mode
void settings() {
  size(canvasSideLength, canvasSideLength);
}
*/
​
void setup() {
  /* For processing.js */
  size(canvasSideLength, canvasSideLength);
​
  scaleFactor = (float)canvasSideLength / (float)INTERNAL_CANVAS_SIDE_LENGTH;
​
  frameRate(IDEAL_FRAME_RATE);
​
  // Prepare font
  final String fontFilePath = "Lato-Regular.ttf";
  final String fontName = "Lato";
  smallFont = createFont(USE_WEB_FONT ? fontName : fontFilePath, 20.0, true);
  largeFont = createFont(USE_WEB_FONT ? fontName : fontFilePath, 96.0, true);
  textFont(largeFont, 78.0);
  textAlign(CENTER, CENTER);
​
  rectMode(CENTER);
  ellipseMode(CENTER);
​
  currentKeyInput = new KeyInput();
  
  newGame(true, true);  // demo play (computer vs computer), shows instruction window
}
​
void draw() {
  background(255.0);
  scale(scaleFactor);
  system.run();
}
​
void newGame(boolean demo, boolean instruction) {
  system = new GameSystem(demo, instruction);
}
​
void mousePressed() {
  system.showsInstructionWindow = !system.showsInstructionWindow;
}