Young Frankenstein, a revised version of Mel Brooks’s 2007 Broadway musical parody, is winning accolades over in London, but Eric B. Sirota’s version of the Frankenstein story, receiving its world premiere on a budget a hundredth of the size, is surely much more faithful to Mary Shelley’s 1818 novel. Sirota, who wrote the book, music and lyrics for Frankenstein, imbues his show with the serious philosophical underpinnings of Shelley’s original: the dangers of man playing God, the belief in a higher power, the pitfalls that science may hold for overweening practitioners. But even with capable performers, the more adult approach comes up short.