It's the keyboard type setting in Vice. Graphics is working, Business is not working. Keypad3 is working, but all other keys in main menu do nothing. But i can quit the demo mode with Space. And in 8032 mode the business keyboard is working. Weird :-)
Anyhow, fun little game!
P.S. Love your game cracking series on Youtube. I wish there were any games left that needed cracking.