better touch function

main.py

@@ -633,7 +633,7 @@ async def main():
     global running, can_use_tilt, can_use_on_top, game_finished
     global current_case, transition_counter, state
     global screen, clock, font, instruction_image, background_image
-    global touch_start
+    global touch_start_time
 
     await init_game()
     load_case_images()
@@ -674,7 +674,7 @@ async def main():
         for event in pygame.event.get():
             if event.type == pygame.QUIT:
                 running = False
-            elif event.type == pygame.KEYDOWN or event.type == pygame.JOYBUTTONDOWN or event.type == pygame.JOYHATMOTION or event.type == pygame.FINGERDOWN or touch_start:
+            elif event.type == pygame.KEYDOWN or event.type == pygame.JOYBUTTONDOWN or event.type == pygame.JOYHATMOTION or event.type == pygame.FINGERDOWN or touch_start_time>0:
                 if state == 1:  # PLAYING
                     if ((event.type == pygame.KEYDOWN and event.key == pygame.K_LEFT) or
                         (event.type == pygame.JOYHATMOTION and event.value[0] == -1) or