I am truly sorry. I should have mentioned about the arrow. First the second player(one with arrow keys controls) should reach there. Then if you enter it again you should be able to switch scenes. To sum up, both players should be inside the arrow and if it doesn't work try entering again. Please confirm if this error was solved.
Viewing post in The Legend of Wealth jam comments
I thought about that but it made it more difficult to play single player while controlling both the players at once and constantly moving the camera to see the other player. This feature improves team coordination in multiplayer and hand coordination in single player mode. That is why I didn't make a separate feature/mode for single player