I keep clicking play on Green Orange mode and the text in the bottom left changes to Entering: P1 but nothing happens. It says there's a second player as well even though I just want to play singleplayer. :(
What are you pressing to start Green Orange mode? For the record, you will have to press again after selecting the mode to proceed: either Fire 1 (Z on keyboard, A on XInput pad) or Enter/Start.