The thing in the middle of the screen directs your two characters, don't let them touch, green circle is the objective, while the lighter green circle is where it is going to go when either of the two characters touch the green circle. Turn on Turbo Mode for best experience. (Shift + Start Flag)
I honestly made this game when I was going to make a completely different game on Castle but then I struggled, made changes to make it easier for myself and now I have this fun little game