I guess I'll have to be the dissenting opinion on this one because I thought it approached awful most of the time, saved only by a wonderful leading performance by Barrett Wilbert Weed.
Everything that made the movie so wonderful has been stripped away. Sure, most of the plot and memorable lines remain, but the tone set by the film is what made them funny. This is running on the fumes of nostalgia that they are counting on the cult fanbase to bring to the proceedings.
I know Heathers is often lumped together with Mean Girls and the like, but the film I think it has much more in common with is Carrie. There's more dark humor, but it FEELS like that film. I think it was a big mistake to not even attempt to capture the absolute weirdness of the film. Think of that fantastic opening sequence where the Heathers are playing croquet and it turns out they aiming the balls at Winona's head! It's so trippy and world-building.
The musical isn't quite a parody, but it winks so hard at the material that it verges on it. I think the comparison made to Lysistrata Jones is unfair- to Lysistrata Jones. This is more in line with The Toxic Avenger and Evil Dead, making it a good fit for New World Stages at least.
The thing that is so lamentable is that I think Heathers could make an excellent musical. Dark comedy/the macabre is one of the hardest genres to adapt, but I think it can be done.
The score was so disappointing. If you're going to go the bubblegum route you might as well make your tunes catchy. As my friend remarked upon leaving the theater, "It wasn't really bubblegum- just sticky!" There was a cringeworthy song about Blue Balls that made one long for "We've Got Girls (By the Balls)!" JD was musicalized poorly, but even so the actor was able to rise about his song about brain freezes from 7-11 slushies.
I don't know why the expanded Martha's role so much. I didn't really think they made it work, and her big ballad did nothing for me. What was hysterical about Martha (other than her hilarious BIG FUN t-shirt) was that she didn't speak for the entire film until the final scene.
There stage was mostly bare and I don't think they utilized the second layer upstage enough.
It's sad for me not to like this more because of my affection for the movie, and this will now be my go to example for "missed opportunity" until something equally disappointing comes along.
Marie: Don't be in such a hurry about that pretty little chippy in Frisco.
Tony: Eh, she's a no chip!