For a while, it looked like this film would have the unexpected idea that it was better to marry a bride of Satan than enter a loveless marriage for the sake of power, but the witch's eventual rejection of her evil ways and Wally's speeches about how love works derailed that brief moment of subversiveness (the noun form of subversive should be "subversity," damn it). So the happy ending is instead that she renounced her power to get married, which doesn't sit quite as well.
It's still a visually appealing film, with its cheezy smoke effects (which were probably not that cheezy back then, and that's what makes them even more fun) and its free-moving brooms and its simple cinema…