Не перерисовывается изображение

from PyQt5 import QtWidgets
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QMouseEvent
from PyQt5.QtWidgets import *
from Levels import firstLevel
 
import sys
          
class KugameUI(QMainWindow):
 
    def __init__(self, game):
        super().__init__()
        self.setWindowTitle("Kugame")
        self.setFixedSize(500, 500)
 
        layout = QGridLayout()
 
        for i in range(len(game.level)):
             for j in range(len(game.level[i])):
                if(game.level[j][i] != ''):
                    label = QLabel(game.level[j][i].image)
                    label.setStyleSheet("font-size: 60pt; " + "color: " + game.level[j][i].color.name.lower() + ";")
                    label.mousePressEvent = lambda event, lbl=label, x = i, y = j: (game.shiftBall(y, x, 0, 1), layout.update()) if event.button() == Qt.LeftButton and lbl.text() == '●' else None
                    layout.addWidget(label, j, i)
    
        widget = QWidget()
        widget.setLayout(layout)
        self.setCentralWidget(widget)
 
def searchMove(ball):
         print("Click")
 
def application(game):
        app = QApplication(sys.argv)
        window = KugameUI(game)
        window.show()
        sys.exit(app.exec_())