True, this won't help the 1-btn-joystick-purists, but if it's super simple... pretty pleeeaaase? :-))
Ghouls'n'Ghosts: you're right, of course. Just had a proper look at some videos from the Arcade version and yes: this seems like quite another beast.
How about "Xain'd Sleena" (Soldiers of Light)? I was so disappointed by the Amiga port back then... but loved the kind-of-similar "Turrican" all the more (as we all did).