McHenry in Vulture seems to have a lot of positive things to say...but ultimately swings negative for the show not going deep enough? Mixed.
https://www.vulture.com/article/theater-review-death-becomes-her-broadway-musical.html
"The whizzing refusal to look deeper grows more nagging as Death Becomes Her continues. The first act ends with an impressive re-creation of one of the film’s signature CGI moments, an illusion here designed by Tim Clothier. The second ups the ante with a severed neck and a shotgun blast through the torso, tricks accomplished with careful misdirection and (to my mind, charmingly) obvious body doubles. The effects are fun, and as with Paul Tazewell’s costumes and Derek McClane’s set, a patina of cheapness keeps the thing in the mode of camp. But where you might hope for a musical to expand on, or at least more deeply interrogate, its source material, this production maintains the level of interiority suggested by Zemeckis’s film, which is to say, not much. It’s a loss: Think of Groundhog Day, using its second act to curlicue into the existential musings of secondary characters, or Legally Blonde’s deploying its title song as a melancholy beat before its own reprise. (Or even—not to set too high a bar—A Little Night Music’s score, cutting bedroom farce with deep feeling.) Death Becomes Her avoids forcing Madeline and Helen to look in the mirror and contemplate. Yes, these women would hate both mirrors and any form of introspection, but why not tell us more about Madeline’s issues with her mother? Or expand on Helen’s brief soliloquy about how, if she never ages, she’ll just wander the earth until the sun devours the planet and she gets sucked into a black hole, unable to die? The line is played for a laugh—“well, don’t be a stranger!” Madeline counters—but it’s wild and dark and if set to music, might make for a dirge both grim and hilarious."