I tried reopening the game, but it only shows up as a small rectangular window, the audio plays in the background, but that's it.
Hello, sorry for the delay. That is really weird. But you can try to press the "windows+up arrow" keys to enlarge it. Or try "Alt+Return" It should set it to full screen.
I tried reopening the game, but it only shows up as a small rectangular window, the audio plays in the background, but that's it.