Winuae has crashed? At least my winuae+whdload+my own adf didn't.
Ah I remember a weird thing.
Magazine's description says "8 Levels Demo", however,
there were only 7 levels I could find.
Your description of WHDload's slave also says "this is an 8 level demo".
Did you confirm existance of 8th stage? (perhaps 2nd secret room somewhere)?
I have already pushed "up" key (of joystick) at all platforms, btw.