JavaFX and Scene Builder - Flappy Bird

Application.java

package com.example.flappybird;

import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.stage.Stage;

import java.io.IOException;

public class Application extends javafx.application.Application {
    @Override
    public void start(Stage stage) throws IOException {
        FXMLLoader fxmlLoader = new FXMLLoader(Application.class.getResource("view.fxml"));
        Scene scene = new Scene(fxmlLoader.load());
        scene.getRoot().requestFocus();
        stage.setTitle("Flappy Bird!");
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        launch();
    }
}

Controller.java

package com.example.flappybird;

import javafx.animation.AnimationTimer;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.shape.Rectangle;

import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    AnimationTimer gameLoop;

    @FXML
    private AnchorPane plane;

    @FXML
    private Rectangle bird;

    double yDelta = 0.02 ;
    double time = 0;
    int jumpHeight = 100;

    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
        load();

        gameLoop = new AnimationTimer() {
            @Override
            public void handle(long l) {
                update();
            }
        };
        gameLoop.start();
    }

    @FXML
    void pressed(KeyEvent event) {
        if(event.getCode() == KeyCode.SPACE){
            fly();
        }
    }

    private void fly(){
        if(bird.getLayoutY() + bird.getY() <= jumpHeight){
            moveBirdY(-(bird.getLayoutY() + bird.getY()));
            time = 0;
            return;
        }

        moveBirdY(-jumpHeight);
        time = 0;
    }

    //Called every game frame
    private void update() {
        time ++;
        moveBirdY(yDelta * time);

        if(isBirdDead()){
            resetBird();
        }
    }

    //Everything called once, at the game start
    private void load(){
        System.out.println("Game starting");

    }

    private void moveBirdY(double positionChange){
        bird.setY(bird.getY() + positionChange);
    }

    private boolean isBirdDead(){
        double birdY = bird.getLayoutY() + bird.getY();
        return birdY >= plane.getHeight();
    }

    private void resetBird(){
        bird.setY(0);
        time = 0;
    }

}

view.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.shape.Rectangle?>


<AnchorPane fx:id="plane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" onKeyPressed="#pressed" prefHeight="600.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/15.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.example.flappybird.Controller">
   <children>
      <Rectangle fx:id="bird" arcHeight="5.0" arcWidth="5.0" fill="#fcba03" height="50.0" layoutX="175.0" layoutY="150.0" stroke="BLACK" strokeType="INSIDE" strokeWidth="0.0" width="50.0" />
   </children>
</AnchorPane>